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Method for refining isoprene by extractive distillation

A technology for extractive distillation and isoprene, which is applied in the field of isoprene purification by extractive distillation, can solve the problems of unsatisfactory dissolving and dispersing properties of polymerization inhibitors, and achieves improved dissolving and dispersing properties and good polymerization inhibiting properties. Effect

Inactive Publication Date: 2011-12-28
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] The invention provides a method for refining isoprene by extractive distillation, which adds components including piperidine oxygen free radicals and / or nitrophenol polymerization inhibitors to the system during the extractive distillation process. By adding an auxiliary component to the polymerization inhibitor, the technical problem of the unsatisfactory dissolution and dispersion of the polymerization inhibitor in the system is solved

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  • Method for refining isoprene by extractive distillation

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Embodiment 1～10

[0025] Components A and B each take a suitable compound, put it into the solvent dimethylformamide (DMF) according to the required amount, and stir until completely dissolved to prepare a polymerization inhibitor solution for later use. See Table 1 for the proportions of component A and component B, component A and component B, and solvents used in each embodiment.

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Abstract

A method for refining isoprene by extraction and rectification, in which isoprene is subjected to extraction and rectification in the presence of solvent dimethylformamide, and a polymerization inhibitor that inhibits the polymerization of isoprene is added to the system, and its components Contains Part A and Part B. Wherein component A is piperidine oxygen free radical and / or nitrophenol, and component B is diethylene glycol monomethyl ether and / or diethylene glycol monobutyl ether; In parts by weight, component A: component B= 1: (0.5-2.0). The polymerization inhibitor is first prepared into a solution with solvent dimethylformamide and then added to the extractive distillation system, in parts by weight, (component A+component B): dimethylformamide=(2~8): 10; The addition amount of the polymerization inhibitor is 0.3-3.0wt.‰ based on the amount of component A based on isoprene. The invention greatly improves the solubility and dispersibility of the polymerization inhibitor in the extraction and rectification system by adding an auxiliary component to the polymerization inhibitor, so that the polymerization inhibitor has better polymerization inhibition performance.

Description

technical field [0001] The invention relates to a method for refining isoprene, in particular to a method for refining isoprene by extractive distillation using dimethylformamide as a solvent. 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 petroleum C5 fractions can reach the purity of chemical grade, which can meet the requirements of synthesizing most fine chemical products , but if it is used as a monomer for synthetic rubber, plastics and other synthetic materials, it should be further refined to remove im...

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Application Information

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IPC IPC(8): C07C11/18C07C7/08C07C7/20
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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