The Rapid Development Of Non-toxic Tributyl Citrate Production And Application - Non-toxic Tributyl

HC plastic mesh information: International commercial goods on the production and

application requirements to achieve energy saving, clean, security and "green" technology. To this end China has also developed regulations and measures relating to. 2005 PVC in the domestic consumption of 9,000,000 t; 2010 their consumption will reach 9.78 million t, the world PVC consumption power. Consumption in 2005 Plasticizer More than 100 million t, which is mainly double acetate phthalate (DEHP); but the Plasticizer Carcinogenic toxicity, people had anemia, hematuria, affecting the liver cells and white blood cell [1]. U.S. FDA (Food and Drug Administration) and the European Union banned its used in food packaging, cosmetics, children's toys. The European PVC bags from China each year 220 000 t; the United States 40% of PVC bags imported from China, Germany, 50% of toys made in China; the EU is the largest toy exporter in China, accounting for 20% of export toy market, the output value of 195 billion, and average annual growth rate of 40%. 267 Japanese workers (the required standards of food additives) provides raw materials for toys containing DEHP in the PVC can not resin; the purposes of Rule 25, the Food Sanitation Law of Japan's first have this requirement.

New non-toxic, odorless, mildew retardant but also multi-functional biodegradable "green" tributyl citrate (TBC) plasticizer can be used for food, medicine and equipment packaging, food hygiene products and toys, and artificial leather clothes, shoes, sofa, flooring, wall wallpaper, pipe, transport and military ships submarines, aircraft, spacecraft within Plastic Products "Green" by plastic, agricultural film board, plastic household appliances plasticized. Abroad, TBC have to develop our country as a citric acid producing countries and exporting countries, the rapid development of TBC and its downstream products for domestic need, while the economic benefits of high availability.

1TBC physical properties TBC molecular formula C18H32O7, molecular weight 360.44g/mol, a colorless or pale yellow liquid with acetone, CCl4, mineral oil, acetic acid, castor oil, alcohol and solvents mixed; not dissolve in water, non-toxic tasteless , volatile small, water-resistant light-fastness, and vinyl resins, cellulose acetate, butyric acid, acetyl cellulose, ethyl cellulose, benzyl cellulose, good compatibility, good performance to plasticized plasticized agent; also not the growth of bacteria with anti-bacterial, non-irritating, flame resistance and biodegradability; LDG50 rat oral> 7mL / (kg body weight), cat> 35mL / (kg body weight), with 10% TBC feed rats for 8 weeks, no organ abnormalities. TBC insoluble in vivo and excreted, no impact on human security. TBC quality of domestic sub-quality product and a product [2], respectively: Appearance Colorless transparent liquid, almost transparent colorless liquid; color (iodine colorimetric) 50; acidity (citric acid dollars mgKOH / g) 0.015; moisture 0.3; content 99.7%; d2041037 ~ 1.047.

2 energy-saving "green" production method

Tributyl citrate is citric acid and butanol by heating the catalyst esterification reaction. Because the different catalysts, alcohol and citric acid ratio, heating method, time, materials are stirred to affect varying degrees of molecular motion product yield, purity, ease of waste treatment, pollution, and affect energy levels, equipment utilization rate and production costs. When using H2SO4 as the catalyst, the amount of raw materials for the reaction of 03%, butanol and citric acid molar ratio of 3.6 to 4.5 / 1, reaction time 4.5h, the esterification rate of 92.1% ~ 92.44%. Advantages of low cost H2SO4 (450 yuan / t), but the equipment and pipeline valves are corrosion and stainless steel reactor, large investment in by-product reactant, the yield is not high, post-treatment processes and more Currently there are applications in industry; when the amino acid used as catalyst, the amount of 3.9% citric acid, alcohol / acid molar ratio of 4 / 1, the reaction time was 2.5h, the esterification yield was 98.27%, Catalyst can be recycled several times using short reaction time, high yield; but the catalyst for the more expensive (03,000 yuan / t), and the amount of large, industrial production had used; when silicon acid as catalyst, the amount of 1.5% citric acid, alcohol / acid molar ratio of 5.5 / 1, reaction time is 2.5h, the esterification rate of 98.7%, its short reaction time, higher yield, but the alcohol / acid ratio, energy consumption more equipment use rate, the catalyst is expensive; when using phosphotungstic acid as catalyst, the amount of 3% citric acid; alcohol / acid ratio of material quality 5 / 1, the reaction time was 4.5h, the esterification rate of 98 %, due to alcohol / acid ratio is too large heat recovery excess alcohol consumption and the consumption of cooling water and more small-capacity utilization, response time and long production cycle, although no corrosion of equipment, difficult to be used in industry; solid activated carbon more complex acid catalyst is 1% of citric acid, reaction time 3h, the esterification rate of 97.6%, but the alcohol / acid ratio of 6.5 / 1, recovery of excess alcohol too much energy, equipment utilization is low; when mixed with solid acid as a catalyst, its amount was 1.5% of the total reactants, reaction time 3h, alcohol / acid ratio of material mass is 4 / 1, the esterification rate of 97.67%, have been used enamel reactor can be, but this goods catalyst too expensive; when using p-toluenesulfonic acid as catalyst (7800 yuan / t), its mass consumption of citric acid 0.7%, reaction time 3h, the esterification rate of 95.5%, but the alcohol / acid materials mass ratio of 5.5 / 1, too, more energy, capacity utilization is small; when the water co-Sodium [three] (1,500 yuan / t) as catalyst, the amount of citric acid 7.81%, reaction time is 2.5h, the esterification rate was 98.4% and the purity of 99.4% and alcohol / acid ratio of 4.2 on Mass / 1, catalyst too costly; using tetrabutyl titanate as catalyst, the amount of citric acid 1.2%, the esterification rate of 99.32%, purity 99.5%, but the catalyst expensive (28,000 yuan / t), the high cost; with FeCl3? 6H2O as catalyst, the amount of 3% citric acid, no pollution, alcohol / acid ratio of material mass is 4 / 1, reaction time 35h, yield was 95%, while FeCl3? 6H2O cheap, but the amount of many, it is also easily moisture; using Ti (SO4) 2/SiO2 as catalyst , the amount of citric acid 6.3% alcohol / acid molar ratio of 3.9 / 1, the reaction of plastic 25h, esterification rate of 96.5%, non-corrosive, equipment investment, but too much catalyst.

by: gaga

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