Method for preparing polyether polycarboxylic acid type high-efficiency water reducing agent from polyethylbenzene tower bottom high-boiling residues

A technology of polyether polycarboxylic acid and high-efficiency water reducing agent, which is applied in the preparation of sulfonic acid, chemical instruments and methods, catalysts for physical/chemical processes, etc., can solve the problems of high industrialization cost, large amount of benzene, and high impurity content in products. Achieve good industrial application prospects, improve water reduction performance, and improve the effect of water reduction rate
CN113698546AActive Publication Date: 2021-11-26CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2021-11-26

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Abstract

The invention relates to a method for preparing a polyether polycarboxylic acid type high-efficiency water reducing agent from polyethylbenzene tower bottom high-boiling residues. The polyether polycarboxylic acid type high-efficiency water reducing agent is prepared by free radical polymerization of arone olefin, a double-bond-containing macromonomer and a micromolecular monomer, and the arone olefin is prepared by catalytic acylation of poly-ethylbenzene sulfonic acid and unsaturated acylate by using a bifunctional molecular sieve encapsulated catalyst. The bifunctional molecular sieve encapsulated catalyst is prepared by one-step hydrothermal reaction of sodium metaaluminate, sodium hydroxide, modified silicon dioxide, N,N,N-trimethyl-1-amantadine, carbon nanotubes and (2,2'-bipyridine) nickel diiodide. The polyethylbenzene sulfonic acid is prepared by sulfonating the high-boiling residues at the bottom of a polyethylbenzene tower. According to the method, the polyethylbenzene tower bottom high-boiling residues serve as raw materials, polyether polycarboxylic acid type high-efficiency water reducing agent molecules are prepared through the steps of sulfonation, acylation, free radical polymerization and the like, and the polyether polycarboxylic acid type high-efficiency water reducing agent is practically applied to the building field and has important significance in resourceful treatment of the ethylbenzene tower bottom high-boiling residues.
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Description

technical field

[0001] The invention belongs to the technical field of construction admixtures, and in particular relates to a method for preparing polyether polycarboxylate high-efficiency water reducers from polyethylbenzene tower bottom high boilers. Background technique

[0002] Ethylbenzene is an important petrochemical basic raw material, which is mainly synthesized by the catalytic alkylation reaction of high-purity ethylene and benzene, and is the main raw material for the production of styrene. In addition to the selective alkylation of benzene and ethylene to generate ethylbenzene, many side reactions will also occur to generate polyethylbenzene (diethylbenzene to hexaethylbenzene), diphenylethane, diphenylmethane and other high boiling point The by-products remain in the bottom of the rectification tower, and the average molecular weight of the high boilers at the bottom of the ethylbenzene tower is 180-210. Because the composition of the high boilers at the botto...

Claims

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