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 a period of reaction of methyl acrylate spot cooling. 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, the reaction mixture was distilled, collecting 65 ~ 95 ℃ distillate to give the crude product. Washed with 5% NaCO3 solution until neutral and washed twice with saturated NaCl solution, dried with anhydrous NaSO4 distilled direct methacrylate, 72 ~ 74 ℃ collected fractions, the product is obtained. 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] Of course there are more complex situations, but still simplified and as a continuous phase reaction of the above reaction types. A great variety of chemical reactions is difficult to establish a simple classification criteria. However, still some similar chemical reactions can be classified methacrylate, such as: the disproportionation reaction: refers to the same element of the oxidation occurs between molecules of the same substance in the same valence reduction reaction. "Differences on the valence change" to the same element valence redox reaction occurs in the process, some increase and some decrease. Disproportionation reaction element must have a corresponding high and low valence state Shandong methacrylate compounds, disproportionation reaction occurs only on the elements of the central parity states. Fluorine (F2) no disproportionation as elemental fluorine electronegativity largest no positive valence, only negative valence. Cangzhou methyl acrylate, methyl acrylate wholesale high quality, Xiang dry chemical (certified merchants) by Andrew dry Jinan Chemical Limited. Jinan Cheung Dry Chemical Co. (www.xiangqianhuagong.com) (www.dilunyierchun.com) is specialized in the "glycol" enterprise, the company of "honesty, hard service" concept, to provide you with the most quality products and services. Welcome to inquire! Contact: Mr. You can also access (www.dilunyierchun.com/supply_details_39798620.html), for more information about the company.