What is Erythorbic Acid?

Erythorbic Acid is a kind of stereo isomer, vitamin C and so on chemical properties similar to vitamin C. Different ascorbic acid as a white to pale yellow or crystal powder, odourless, has a sour taste, 166-172 ℃, melting point and decomposition, with light gradually. Drying condition and is very stable in the air, and when exposed to the atmosphere in aqueous solution is metamorphic rapidly, almost no physiological activity of ascorbic acid, its oxidation resistance is better than that of ascorbic acid, but poor heat resistance, strong reducibility, heavy metal ions can promote the decomposition of ascorbic acid soluble in water, room temperature solubility of 40 g / 100 ml, soluble in ethanol, 5 g / 100 ml, hardly soluble in glycerin, insoluble in benzene, 1% aqueous solution of the PH value of 2.8.

Oxidation resistance

Erythorbic Acid, the antioxidant capacity of far more than vitamin C, no vitamin C, but it will not hinder the body against the bad blood acid absorption and utilization. Ingested ascorbic acid, can be transformed into vitamin C in the body.

The us food and drug administration (1980) will this product as a generally accepted safety material.

2 physical properties

Erythorbic Acid  is white to yellow-white crystal granular or crystal powder, odourless, slightly salty, melting point 200 ℃ above decomposition, exposed to the air is quite stable in dry state without becoming dry. But in aqueous solution, when there are air, metal, heat, light, oxidation, soluble in water, room temperature solubility is 16 g / 100 ml, hardly soluble in ethanol, 2% aqueous solution of the PH value of 6.5 to 8.0.

About us

   SINOCHEM NANJING is a diversified large-scale group company, mainly focusing on manufacturing, research and development of new products, and currently, its business has expanded to the fields of Industry Chemicals, Food additives & Feed Additive, etc.
    In recent years, SINOCHEM NANJING has been developing rapidly with expanding scale, improving benefits and outstanding management. The company has been awarded the certificates of ISO9001, ISO14001 and OHSAS18001 by TUV. Meanwhile, it has also been honored as the "AAA" grade enterprise within the fields of Qualification and Credit by the Shenzhen Development Bank and the Contract Abiding, "AAA" grade enterprise by the Provincial Administration for Industry and Commerce for years, as well as "AAA" grade excellent foreign trade enterprise by the Committee of the Credit System of China Foreign Trade & Economic Cooperation Enterprise. SINOCHEM NANJING has been devoting itself to offering qualified products, reliable service with competitive price and professional staffs to meet the demands of the clients.

what is Citric Acid Anhydrous?

Citric Acid Anhydrous , formula C6H8O7, is a colorless, translucent crystals or white granules or white crystalline powder , often containing one molecule of water of crystallization , odorless, very sour taste , soluble in water, alcohol and ether. Suitable crystallization temperature control obtained anhydrous citric acid . Acidic aqueous solution. In dry air, slight weathering , deliquescence in moist air . Mainly for the food and beverage industry as a sour agent , acidity regulator, flavoring agents and preservatives , preservative . Also the chemical industry, cosmetics industry and the industry as a washing antioxidants, plasticizers , detergents.

Character

Colorless transparent crystals or white particles, or white crystalline powder, often contain molecular crystal water, odourless, taste very acid, soluble in water, alcohol and ether. The calcium salt easy dissolve in cold water than hot water, and the properties of commonly used to identify and separate citric acid. Crystallization in control the temperature of the appropriate anhydrous citric acid can be obtained. Acidic aqueous solution. Micro have to weathering in dry air, deliquescence in moist air. More than 175 ℃ decomposition release water and carbon dioxide.

Physical and chemical properties: the relative density 1.542, melting point 153 ℃ (water), the refractive index of 1.493 ~ 1.509, the solution crystallization critical temperature 36.6 ℃, 36.6 ℃ above crystallization of anhydrous citric acid, crystallization of citric acid monohydrate) below 36.6 ℃.

Use

Mainly used for food and beverage industry as sour agent, acidity regulator, flavouring agent, preservative and antistaling agent. Also in the chemical industry, cosmetics industry and washing industry used as antioxidant, plasticizer and detergent

Storage

Avoid light, sealed, dry place storage

About us

   SINOCHEM NANJING is a diversified large-scale group company, mainly focusing on manufacturing, research and development of new products, and currently, its business has expanded to the fields of Industry Chemicals, Food additives & Feed Additive, etc.

The advantage of filling hollow glass microspheres

The advantage of filling hollow glass microspheres

hollow glass microspheres as the glass filled a, also occupy a certain market share in the market. In nowadays under the condition of all kinds of filling materials dripping wet markets, what is the fill hollow beads in the market for a long time and unbeaten? Let's take a look at the advantage of the hollow beads filled, maybe you will understand.

As a spherical particle, hollow beads filling used in the paint, paint has the following advantages:

1. The dosage of resin/add less amount of potential: because in any shape, spherical with a minimum of specific surface area, also have the fewest demand of resin of hollow bead filled in. The accumulation of particles situation has been improved. Hollow beads filled the wide particle size distribution makes the small ball is able to fill in the space between the big microspheres. The result... In fact is: high addition amount and high solid content, low VOC and reducing the amount of other ingredients;

2. Low viscosity/improve liquidity: with irregular shape particles, filling hollow beads are easy to scroll between each other. It makes use of cenosphere system has low viscosity, good fluidity. And the system of spraying can be also improved;

3. Hardness/wear resistance: hollow beads filling is a kind of high strength, and hard microspheres, it can enhance the hardness of coatings, scrubbing resistance and abrasion resistance;

4. Excellent heat insulation effect: because of Hollow glass microspheres filled hollow sphere structure that makes it fills in the coating has excellent thermal insulation effect;

5. Luster control: as a kind of filler, the role of hollow bead filled can reduce gloss, used to control, even in addition amount under the condition of the demand is higher, they can also eliminate the matting agent like ordinary easy to cause the increase in viscosity, and the cost is low;

6. The inertia: hollow beads filling is composed of inert ingredients, thus has excellent durability, corrosion resistance, corrosion resistance and chemical resistance;

7. Opacity: hollow beads filling up the hollow spherical slow fire and scattering light, the result is to increase the coating of hiding power;

8. Dispersion: fill the hollow beads scattered as mineral filler, as a result of hollow bead filled thick wall and high compressive strength, it can bear all kinds of mixer, extruding machine and mould machine machining process;

9. No crystalline silicon pollution: unlike other packing, filling hollow beads in crystalline silicon content below the level of no harm. Such cenosphere is seen as a carcinogen, also do not need special hazard warning sign.

The application of vinyl resin anticorrosion performance in the automotive industry

Epoxy vinyl resin called anti-corrosion industry leader in many other ways also have applications, including automobile manufacturing. According to China epoxy resin industry association experts, vinyl ester resin can make all kinds of vehicle components, such as car tyre has also successfully with high strength and vinyl ester resin suppress, than metal tire weight 40 ~ 50%, from 160 ~ 200 ℃ in electrical equipment can be run continuously for more than 10 years and keep enough mechanical strength and dimensional stability. Epoxy vinyl ester resin has higher elongation have better shear strength, the impact of the higher than ISO polyester and good creep resistance and fatigue resistance, and good molding liquidity in the SMC parts making cars, the obtained compelling applications. Expert says, these components include wheel, seat, heat dissipation frame, gate board, engine valve sleeve, etc.

According to the China epoxy resin industry association experts introduced: sheet metal material on the total cost advantage integration is difficult, but many parts total amount is large, is the second placing signage at the noise, corrosion resistance is low; The appearance of the cast aluminum products quality is better than other non-ferrous metals, but the cost is higher, sound-absorbing, poor corrosion resistance; Thermoplastic composite materials (mainly glass fiber reinforced nylon) of superior machinability, short production cycle, but high temperature aging problems, poor durability, size is not stable and cause poor sealing.

So analysis think SMC and BMC is one of the ideal material for the valve set. Cytec Industries Inc Cyglas 695 BMC engine parts production, is a kind of vinyl ester resin containing 25% glass fiber BMC products, including the molding Cornette 5.7 L car cylinder valve cover, injection moulded a 4.3 L 12 gm truck before timing gear chain cover, injection moulded a 5.7 L 3 gm truck before timing gear chain cover, 2.7 L V6DOHC cylinder valve cover, etc.

Vinyl ester resin BMC cylinder valve cover, working temperature of 138 ~ 149 ℃, the curing speed (45 s curing products 3 mm thick, 1.4 ~ 1.8 kg of the valve cover, 1 min curing), good dimensional stability, good resistance to chemical corrosion. China epoxy resin industry association experts say the future, this kind of material to a wide range of applications in the field of transportation, mainly lies in the spare parts, including wheel, seat, heat dissipation frame, gate board, engine valve sleeve, etc

Activated alumina characteristic analysis

In the petrochemical industry, fertilizer industry , widely used as catalysts, catalyst supports . Activated alumina adsorption characteristics and thus used as a gas and liquid desiccants , adsorbents gas purification , drinking water fluoride removal agent , industrial wastewater color and odor eliminating agents.

Can be used with household fluoride in cylinder form a complete set, is the ideal drinking water fluoride removal equipment in the family. The fluoride in filter material can also be used with the waterworks fluoride removal equipment or industrial fluoride removal equipment systems. Household fluoride removal equipment fluoride in liao activation: configuration of aluminium sulfate solution (3 litres of water, 0.3 kg of solid aluminum sulfate), alumina fluoride in filter material to be included in the above solution, soak 5-10 hours abandon to immersion to appropriate mixing (soaked), then wash with clear water for 3 to 5 times, each time 2 liters of water, or mixed with PH reclamation, control the PH 7.5. Activated alumina fluoride in filter material can use 6 to 8 years in a row, when surface tan, fluoride in effect is significantly reduced, this is due to the water pollution of impurities, so it's best to every half an year is treated with dilute hydrochloric acid 3%, its operating method and the regeneration method is the same.

The main factors influencing the activated alumina fluoride agent is

Today mainly for everyone say affect activated alumina fluoride agent adsorption performance what element? . Activated alumina fluoride in a multiple porous spherical material, can have very strong adsorption function, large specific surface area, high compressive strength hardness, long service life, and can be used repeatedly through regeneration methods. This product is a white, spherical porous material non-toxic, odourless, not powder, insoluble in water. Widely used in petrochemical, chemical, textile, metallurgical and other industries of instrument air drying, can also be used for the iron and steel, petroleum cracking gas, PVC, propylene in the liquid phase and gas phase depth is dry. Understand the factors affecting activated alumina fluoride agent adsorption performance, to avoid the disadvantage factors, make active aluminum oxide better work.

(1) particle size: the smaller the particle size, the higher adsorption capacity, but the smaller the particle size, particle strength is lower, affect the service life.

2 raw water PH value: when the PH value is greater than 5, the lower the PH, the higher the adsorption capacity of activated alumina fluoride agent.

(3) initial fluoride concentration in the raw water, the higher the initial concentration of fluorine, adsorption capacity is bigger.

(4) raw water alkalinity: heavy concentration of carbonate ions in raw water, high adsorption capacity will reduce.

(4) the chloride ion and sulfate ion.

（5） the effects of arsenic: activated alumina fluoride adsorption for the arsenic in the water, the accumulation of arsenic in activated alumina fluoride agent on the falling of fluorine ion adsorption capacity, and make renewable elution arsenic ion more difficult.

4A molecular sieve

4A molecular sieve is an alkali metal aluminosilicate , can adsorb water , NH3, H2S, sulfur dioxide, carbon dioxide , C2H5OH, C2H6, C2H4 and other critical molecular diameter less than 4A . Widely used in gas and liquid drying , can also be used in certain gas or liquid purification and purification , such as argon gas from the system.

Molecular sieve is a kind of synthetic with micro groove cubic lattice sialic acid salts. According to the internal cavity of the crystal size and adsorption or reject molecules of different material, thus is called "molecular sieve". Molecular diameter less than the material can enter the molecular sieve of molecular sieve pores diameter crystal crystal, thus by adsorption, otherwise, the rejection. Molecular sieves are determined according to the different material molecular polarity of priority in the order of the adsorption.

According to the molecular adsorption effect on the choice of the size and shape of the different, namely only those smaller than the molecular sieve adsorption aperture molecules. For small polar molecules and unsaturated molecules, has selective adsorption performance, the larger the polarity, not the higher the degree of saturation, the choice and the stronger adsorption. Type A molecular sieve is A kind of molecular sieves which, its structure and NaCl are similar, belong to the cubic crystal system. Due to the 4 a molecular sieve effective aperture of 0.4 nm, so called 4 a molecular sieve, the space network structure by the silicon oxygen tetrahedron element [SiO4] and alumina tetrahedron unit [AlO4] staggered.

Application

1. Polyester additives agent: the role of 4 a zeolite as detergent additives mainly calcium ion exchange the water softening water, remove dirt and prevent dirt deposition. 4 a molecular sieve is most used in the generation of phosphorus to help lotion and apply the most sophisticated products. 4 a molecular sieve to replace sodium tripolyphosphate as detergent builder to solve the pollution of the environment has a major role. 4 a molecular sieves also can be used as a soap abrasive molding agent, toothpaste, etc.

2. Environmental protection, sewage treatment, 4 a molecular sieves can remove the NH3 - N in the sewage and Pb2 +, Cu2 +, Zn2 +, and Cd2 +, etc. Industry and agriculture, civil, and aquatic animal husbandry in the discharge of wastewater containing ammonia nitrogen, not only harm fish such as survival, pollution in aquaculture environment, and promote the growth of algae, and lead to the blocking of rivers and lakes. Due to the 4 a molecular sieve of NH4 + high commutativity choice, has been successfully applied in the field. From metal mining, smelting, metal surface treatment and effluent from chemical industry and other departments, containing heavy metal ion great harm to human body. Deal with the sewage with 4 a molecular sieves in addition to guarantee water quality qualified, can also recycle heavy metal.

3. The other purposes:

(1) water treatment - hard water softener, can replace the current widespread use of sulfonated coal in our country, thus reducing costs;

(2) the metallurgical industry - separating agent, separation, extraction from brine potassium, rubidium, cesium, etc. In industry for enrichment, separation and extraction process;

(3) the petrochemical industry, catalyst, desiccant, adsorbent;

(4) agriculture - soil conditioner;

(5) the medicine - silver zeolite antimicrobial agent.

About us

SILICA GEL supplier----Fenglong Chemical Co., Ltd. is primarily engaged in manufacturing silica gel since 2001. Our silica gel manufacturing plant is located in Maanshan with manufacturing capacity of more than 500-MT silica gel per year. We are manufacturing Indicating silica gel & Non-Indicating type of SILICA GEL in all grades such as blue silica gel, orange silica gel and basic silica gel such as type A silica gel , type B silica gel ,type C silica gel and another special silica gel Column chromatography silica gel . We are Chinese manufacturer of silica gel and supplying it across the world. Silica gel manufactured by us is of best quality which is widely used as cat litter, dessicant silica gel in anti-rusting and moisture-proof of product, packaging, drying and separation of gases, the catalyst carrier of petrochemical industry and so on.

Factors influencing the biochemical degradation of LAS

Factors influencing the biochemical degradation of LAS

Physical and Chemical Properties

Appearance under normal temperature as milky, liquid material; when it is warmed, it becomes transparent liquid. Soluble in water while insoluble in chloroform. Air bubbles would be generated when in water, which is of such functions as dispersing, decontamination and reducing surface tension, etc. It is easy to form stratified layer after long storage time while the chemical properties do not change, so it is better to use after thorough stirring.

The temperature

Microbial growth need to be in the right temperature, only in the appropriate temperature, the degradation rate of LAS was biggest. Optimum growth and microorganism decomposition temperature at 30 ℃, and its activity in a certain temperature range varies with temperature

Increased. Studies have shown that at 20 ℃, linear alkyl benzene sulfonate (LAS) degradation in the aquatic system speed is (1.5 ~ 3.5 ℃) 20 times. Chemical reaction rate is affected by temperature. So the temperature can affect LAS biochemical degradation.

PH

In general, the pH of water, microbial activity has a direct impact. Suitable pH range of different microorganisms. Degradation of LAS microorganisms such as bacteria, actinomyces, pH change will cause the change of cell charge, at the same time will affect the activity of enzyme in cells. However, for a river, the influence of pH value on the LAS is not very obvious.

The initial concentration of LAS

Pollutant itself to microbes, generally speaking, there are certain toxicity, and the toxicity increased with the increase of pollutants concentration increased. Studies show that when the concentration of LAS > 10 mg/L, the inhibition of its degradation is obvious. And studies have shown that LAS can affect aerobic degradation of organic matter in PH self-adjusting ability. When the initial concentration of LAS is greater than 20, then stop the aerobic degradation of organic matter in the PH of self-adjusting ability, reduce microbial activity.

Effect of dissolved oxygen
Most of the LAS aerobic degradation is mainly to increase the dissolved oxygen concentration , can significantly increase the degradation of LAS . Aerobic biodegradation of LAS mainly contains three kinds of mechanism: ( 1 ) by ω- oxidation of the terminal methyl group on the alkyl chain by oxidation of β or α- oxidation of long- chain molecules that form short -chain sulfonic disconnect benzene carboxylic acid ; ( 2 ) oxidation of the benzene ring to open crack action ; ( 3 ) de- substituted sulfonic acid salt removed by this process . However, these three mechanisms on the role of sequence researchers have not yet reached consensus view . Studies have shown LAS can be degraded under anaerobic conditions .

Other effects of coexisting substances
Biodegradation of LAS will be affected by the presence of other pollutants , when the water there are other biodegradable organic pollutants , will produce inhibition of microbial degradation of LAS or catalytic role in some of the water -binding makes the LAS chemically changed thus changing the biochemical degradation of LAS . LAS primary pollutants into the water after the other pollutants combine to form with a certain degree of dispersion of colloidal particles of industrial wastewater and domestic wastewater physicochemical and biochemical characteristics has a significant impact , and produce potentially dangerous.