One-step synthetic process of rubber antioxidant RD

A technology of rubber anti-aging agent and synthesis process, applied in the direction of organic chemistry, can solve the problems of low content of active ingredients, inability to remove in time, short process flow, etc., and achieve the effect of increasing the content

Inactive Publication Date: 2015-05-06
QINGDAO WANGYU RUBBER
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  • Abstract
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  • Claims
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Problems solved by technology

The process is short, less equipment, and low cost, but in the reaction process, unreacted raw materials ca

Method used

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Embodiment

[0013] The one-step synthesis process of the rubber antioxidant RD of the present embodiment uses aniline and acetone as reaction raw materials, and is characterized in that, using hydrochloric acid as a catalyst, aniline and hydrochloric acid are reacted to synthesize aniline salt hydrochloric acid in a reactor with a stirrer, The generated aniline salt hydrochloric acid is then polycondensed with excess acetone in a reactor with agitator to form a polymer. The hydrochloric acid in the reaction process is neutralized with sodium hydroxide, and acetone, aniline, and oil are recovered from the water phase and waste water tower. After phase clarification, after continuous dehydration in the flash tank, it enters the aniline distillation to remove the aniline, and the polycondensate of aniline is removed, and then enters the finished product distillation tower to remove the former fraction, and finally the anti-aging agent RD product is obtained.

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Abstract

The invention discloses a one-step synthetic process of a rubber antioxidant RD. The process is as below: using aniline and acetone as raw materials for reaction and hydrochloric acid as a catalyst; reacting aniline with hydrochloric acid in a reaction kettle with a stirrer for synthesis of aniline hydrochloride; conducting condensation reaction on the aniline hydrochloride with an excessive amount of acetone in the reaction kettle with stirrer to generate a polymer; neutralizing hydrochloric acid in the reaction process with sodium hydroxide; recovering acetone and aniline from the water phase in a waste water tower; clarifying the oil phase, conducting continuous dehydration in a flash tank, and steaming to remove aniline; and sending the condensation polymer with aniline removed into a finished product distillation tower for removing a front cut fraction, so as to finally obtain the product of antioxidant RD. Compared with a traditional one-step method, the improved one-step method can timely deprive unreacted raw materials, so that the content of active ingredients (dimer, trimer and tetramer) substantially increases.

Description

[0001] technical field [0002] The invention belongs to the technical field of anti-aging agent production, and in particular relates to a one-step synthesis process of rubber anti-aging agent RD. [0003] Background technique [0004] The one-step synthesis process of rubber antioxidant RD means that the condensation and polymerization of raw materials are carried out in the same reactor, and the product can be obtained in one step. The process is short, less equipment, and low cost, but in the reaction process, unreacted raw materials cannot be removed in time, resulting in low content of active ingredients and high content of impurities in the product. [0005] Contents of the invention [0006] The object of the present invention is to provide a one-step synthesis process of rubber antioxidant RD. Compared with the traditional one-step method, the improved one-step method can remove unreacted raw materials in time, and the content of active ingredients (di, tri, tet...

Claims

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Application Information

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IPC IPC(8): C07D215/06
CPCC07D215/06
Inventor 梁松杰
Owner QINGDAO WANGYU RUBBER
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