Process for refining chemical grade isoprene into polymer grade isoprene
An isoprene, polymerization-grade technology, applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc., can solve the problems that the dissolution and dispersion properties of polymerization inhibitors are not ideal, and achieve the effect of improving comprehensive performance.
Inactive Publication Date: 2011-12-28
CHINA PETROLEUM & CHEM CORP +1
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[0005] The invention provides a method for refining chemical-grade isoprene into polymer-grade isoprene. During the refining process, a polymerization inhibitor comprising piperidine oxygen radicals and / or nitrophenols is added to the system, The present invention solves the technical problem that the solubility and dispersibility of the polymerization inhibitor in the system and the effect of polymerization inhibition are not ideal by adding auxiliary components to the polymerization inhibitor
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[0027] Components A, B and C of the polymerization inhibitor each get a suitable compound, put into the solvent dimethylformamide according to the required amount, and be stirred until completely dissolved to prepare a concentration of 50wt.% (with the total amount of all components) The polymerization inhibitor solution of measuring meter) is standby. See Table 1 for the components A, B and C used in each embodiment and their mutual proportions.
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A method for refining chemical-grade isoprene into polymer-grade isoprene, comprising: 1) extracting and rectifying chemical-grade isoprene in the presence of a solvent, dimethylformamide, to remove heavy component impurities; 2) The isoprene extracted and rectified is then rectified to remove light component impurities to obtain polymer grade isoprene. A polymerization inhibitor is added to the extractive distillation system, and the components of the polymerization inhibitor include A, B and C, wherein: A is piperidine oxygen free radical and / or nitrophenol, B is diethylene glycol monomethyl ether and / or Diethylene glycol monobutyl ether, C is N,N-disalicylidene-1,2-propanediamine or N-salicylamide phthalimide, in parts by weight, when A=10, B=5 ~20, C=0.2~0.8. Compared with the prior art, the present invention has the advantage that the comprehensive performance of the polymerization inhibitor is greatly improved by adding an auxiliary component to the polymerization inhibitor used in the refining process to improve the solubility and dispersibility of the polymerization inhibitor component and to inhibit metal corrosion.
Description
technical field [0001] The invention relates to a method for refining isoprene, in particular to a method for refining chemical-grade isoprene into polymer-grade isoprene by using dimethylformamide as a solvent for extraction and rectification. Background technique [0002] Isoprene is a fine chemical raw material with a wide range of uses. It can be used to synthesize many fine chemical products such as spices, pesticides, and pharmaceuticals, such as pyrethroid pesticides, linalool, isophytol, and vitamin E. At the same time, isoprene is also a monomer of many synthetic rubbers, plastics and other synthetic materials. The basic source of isoprene is the extraction and separation of petroleum C5 fractions. At present, the isoprene obtained directly from the extraction and separation of petroleum C5 fractions can reach chemical grade purity (98.50-99.50wt.%), which can meet It is required for the synthesis of most fine chemical products, but if it is used as a monomer for s...
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IPC IPC(8): C07C11/18C07C7/20C07C7/08
Inventor 郭世卓秦技强谢家明蒋芳红郑金达
Owner CHINA PETROLEUM & CHEM CORP
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