4. The method of acrylic acid and acrylic acid esterification with methanol, methanol, expandable graphite are then added to flat-bottomed flask, acrylic acid and methanol molar ratio 1.15:1. Connector trap, reflux condenser, placed in heated and stirred on a magnetic stirrer heating, After the reaction period of time, cooled. Yield is calculated by saponification (with lye and residual acrylic acid, and then adding quantitative KOH solution for saponification, and then titrated with standard HCl solution excess KOH, calculate the ester yield). The esters are separated simultaneously methyl acrylate, the reaction solution was distilled, collecting 65 ~ 95 ℃ distillate to give the crude product. Washed with 5% NaCO3 solution until neutral methacrylate purposes, washed with saturated NaCl solution twice, dried with anhydrous NaSO4 distilled methyl acrylate offer, collect 72 ~ 74 ℃ fraction, derived products. 5. Improved Raper Raper France France improved method for Roma Haas and Dow Pakistan at the end Oxley Act. The former is mainly used to replace 80% of the gaseous carbon monoxide of nickel carbonyl in carbon monoxide; Raper latter also known as high-pressure method, mainly using tetrahydrofuran as a solvent. [1] He left Oxford in 1668 went to his sister's estate to live in London. In London, he set up his own laboratory methacrylate factory outlets, mainly for chemistry experiments. He tried to introduce chemical rigorous experimental methods. 1673 Boyle and Hooke of burning material were investigated and found that in a vacuum, the substance can not be burned. Boyle based on the results of combustion experiments, wrote the paper "New experiments on the relationship between fire and air," the first to reveal the air is necessary for combustion. But he still thinks the role of fire and burn between substances. Further Boyle also found in some plants pigment colors can appear different under acidic and alkaline conditions, thereby introducing the concept of an indicator. 1680 Boyle was elected president of the Royal Society, but because of the oath, he rejected the post. Wholesale methacrylate | methacrylate | Xiang Xiang dry chemical provided by the Jinan Chemical Co. dry. Jinan Cheung Dry Chemical Co. (www.xiangqianhuagong.com) (www.dilunyierchun.com) strong, credible, in Jinan, Shandong alcohol industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Xiang dry chemical into the brilliant and you work for a better future! You can also access (www.dilunyierchun.com/supply_details_39798265.html), for more information about the company.