阅读说明：本技术 一种高效氢溴酸助催化剂的制备方法 (Preparation method of efficient hydrobromic acid cocatalyst ) 是由 杨建平 沈梦桐 赵洪亮 邢新文 于 2019-10-18 设计创作，主要内容包括：本发明提供一种高效氢溴酸助催化剂的制备方法,涉及化学工程中的催化剂技术领域,该方法为将氢溴酸、添加剂按质量比1:0.0001-0.001在20-60℃下进行混合,搅拌为均相溶液,搅拌时间为1-4h。添加剂为2-丙氨基-6-甲基-[1,2,4]-三唑[1,5-a]嘧啶-5-酮、苯并三氮唑、1-(4-溴苯基)-2-(1H-苯并三氮唑-1-甲基)乙醇、2-(1H-苯并三氮唑-1-甲基)-4-氯苯乙酮、2-(1H-苯并三氮唑-1-甲基)-4-溴苯乙酮、2-(1H-苯并三氮唑-1-甲基)-4-甲基苯乙酮中的一种或几种；采用本发明工艺制得的助催化剂稳定性强,催化活性高,添加剂苯并三氮唑类化合物既能维持氢溴酸稳定,又能在PX氧化反应过程中抑制副反应发生,提高产品收率。(The invention provides a preparation method of a high-efficiency hydrobromic acid cocatalyst, which relates to the technical field of catalysts in chemical engineering and comprises the steps of mixing hydrobromic acid and an additive according to the mass ratio of 1:0.0001-0.001 at the temperature of 20-60 ℃, and stirring to obtain a homogeneous solution for 1-4 h. The additive is one or more of 2-propylamino-6-methyl- [1,2,4] -triazolo [1,5-a ] pyrimidine-5-ketone, benzotriazole, 1- (4-bromophenyl) -2- (1H-benzotriazole-1-methyl) ethanol, 2- (1H-benzotriazole-1-methyl) -4-chloroacetophenone, 2- (1H-benzotriazole-1-methyl) -4-bromoacetophenone and 2- (1H-benzotriazole-1-methyl) -4-methylacetophenone; the cocatalyst prepared by the process has strong stability and high catalytic activity, and the additive benzotriazole compound can maintain the stability of hydrobromic acid, inhibit side reaction in the PX oxidation reaction process and improve the product yield.)

1. A preparation method of a high-efficiency hydrobromic acid cocatalyst is characterized in that hydrobromic acid and an additive are mixed according to the mass ratio of 1:0.0001-0.001, and the mixture is stirred into a homogeneous solution.

2. The method of claim 1, wherein the high efficiency hydrobromic acid co-catalyst is prepared by a process comprising the steps of, the additive is one or more of 2-propylamino-6-methyl- [1,2,4] -triazolo [1,5-a ] pyrimidine-5-ketone, benzotriazole, 1- (4-bromophenyl) -2- (1H-benzotriazole-1-methyl) ethanol, 2- (1H-benzotriazole-1-methyl) -4-chloroacetophenone, 2- (1H-benzotriazole-1-methyl) -4-bromoacetophenone and 2- (1H-benzotriazole-1-methyl) -4-methylacetophenone.

3. The method of claim 1, wherein the hydrobromic acid and the additive are mixed at 20-60 ℃ for 1-4 h.

4. The method for preparing a highly efficient hydrobromic acid co-catalyst according to claim 1, characterized in that hydrobromic acid and additive are mixed in a mass ratio of 1:0.0005 and stirred into a homogeneous solution.

5. The method of claim 3, wherein the hydrobromic acid and the additive are mixed at 30-50 ℃ for 2-3 h.

6. The method of claim 3, wherein the hydrobromic acid and the additive are mixed at 40 ℃ for 3 hours.

Technical Field

The invention relates to the field of catalysts in chemical engineering, in particular to a preparation method of a high-efficiency hydrobromic acid cocatalyst.

Background

At present, the industrial production of Purified Terephthalic Acid (PTA) mainly adopts a high-temperature liquid-phase oxidation method, and adopts a reaction system which takes Paraxylene (PX) as a raw material, cobalt acetate and manganese acetate as catalysts, bromide as an accelerator and air as an oxidant.

Hydrobromic acid, a commonly used promoter in the reaction system, is easily oxidized into bromine by air, so that the catalytic efficiency is reduced, reaction equipment is corroded, the production efficiency is reduced, and the equipment cost is increased.

Therefore, the catalyst of the reaction system is modified to maintain the stability of the hydrobromic acid in the reaction, and the method has important significance for improving the product yield and reducing the equipment cost.

Disclosure of Invention

Technical problem to be solved

Aiming at the problems of instability of hydrobromic acid, low catalytic efficiency of a catalyst, low product yield and the like in the prior art, the invention provides a preparation method of a high-efficiency hydrobromic acid cocatalyst, so that the prepared cocatalyst has strong stability and high catalytic activity.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme:

a preparation method of a high-efficiency hydrobromic acid cocatalyst is characterized in that hydrobromic acid and an additive are mixed according to the mass ratio of 1:0.0001-0.001, and the mixture is stirred into a homogeneous solution.

Further, the additive is one or more of 2-propylamino-6-methyl- [1,2,4] -triazolo [1,5-a ] pyrimidine-5-ketone, benzotriazole, 1- (4-bromophenyl) -2- (1H-benzotriazole-1-methyl) ethanol, 2- (1H-benzotriazole-1-methyl) -4-chloroacetophenone, 2- (1H-benzotriazole-1-methyl) -4-bromoacetophenone and 2- (1H-benzotriazole-1-methyl) -4-methylacetophenone;

further, hydrobromic acid and additives are mixed at the temperature of 20-60 ℃, and the stirring time is 1-4 h.

Preferably, hydrobromic acid and the additive are mixed according to the mass ratio of 1:0.0005, and stirred to form a homogeneous solution.

Preferably, hydrobromic acid and the additive are mixed at 30-50 ℃ and stirred for 2-3 h.

Preferably, hydrobromic acid and the additive are mixed at 40 ℃ and stirred for 3 h.

(III) advantageous effects

The invention provides a preparation method of a high-efficiency hydrobromic acid cocatalyst, the cocatalyst prepared by the process has strong stability and high catalytic activity, and an additive benzotriazole compound can maintain the stability of hydrobromic acid, inhibit side reactions in the PX oxidation reaction process and improve the product yield.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.