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Method for preparing isopropyl benzene and obtained isopropyl benzene

A technology of cumene and cumene hydroperoxide, applied in chemical instruments and methods, preparation of peroxide compounds, preparation of organic compounds, etc., can solve problems such as environmental pollution, less involvement, poor catalyst stability, etc.

Pending Publication Date: 2022-05-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN104230640A relates to a method for preparing cumene by hydrogenolysis of α,α-dimethylbenzyl alcohol, which mainly solves the problems of poor catalyst stability and serious environmental pollution in the process of producing cumene
[0006] In the process of preparing cumene by hydrogenolysis of α, α-dimethylbenzyl alcohol, the existing technology is more about improving the activity and selectivity of α, α-dimethylbenzyl alcohol hydrogenolysis by improving the catalyst, while in In the design and development of the hydrogenolysis process, the technical issues of how to realize the stable operation of the device are seldom involved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Oxidation process: Under the conditions of 105°C, 0.4MPa, and controlling the tail oxygen volume content to be lower than 5%, the cumene stream is oxidized with air to obtain cumene hydroperoxide (CHP) with a weight concentration of 20-24%. Oxidizing solution.

[0075] The cumene hydroperoxide oxidation solution is washed with an aqueous solution with a weight content of 2% of NaOH, wherein the volume ratio of the oxidation solution to the alkali solution is 3:1, and the organic acid is removed therein.

[0076] Then use deionized water to wash the oxidation solution at 40°C to remove the residual Na due to alkali washing. + , wherein the volume ratio of oxidizing solution to deionized water is 1:1. After washing with water, let stand to take the oil phase.

[0077] According to the needs of the epoxidation reaction, vacuum concentration is carried out to it, the concentration temperature is 75° C., and the cumene hydroperoxide concentration is obtained as an oxidizin...

Embodiment 2

[0082] Oxidation process: with embodiment 1

[0083] Wash the cumene hydroperoxide oxidation solution with an aqueous solution with a weight content of 2% NaOH, wherein the volume ratio of the oxidation solution to the alkali solution is 3:1, and remove the organic acid therein.

[0084] Then use deionized water to wash the oxidation solution at 40°C to remove the residual Na due to alkali washing. + , wherein the volume ratio of oxidizing solution to deionized water is 2:1. After washing with water, let stand to take the oil phase.

[0085] According to the needs of the epoxidation reaction, vacuum concentration is carried out to it, the concentration temperature is 75° C., and the cumene hydroperoxide concentration is obtained to be 50% by weight of the oxidation solution, and the residual water due to washing is also to a certain extent when concentration is carried out. above is removed. After processing, the organic acid weight content in the cumene hydroperoxide oxida...

Embodiment 3

[0089] Oxidation process: with embodiment 1

[0090] Wash the cumene hydroperoxide oxidation solution with an aqueous solution with a weight content of 4% NaOH, wherein the volume ratio of the oxidation solution to the alkali solution is 4:1, and remove the organic acid therein.

[0091] Then use deionized water to wash the oxidation solution at 40°C to remove the residual Na due to alkali washing. + , wherein the volume ratio of oxidizing solution to deionized water is 2:1. After washing with water, let stand to take the oil phase.

[0092] According to the needs of the epoxidation reaction, vacuum concentration is carried out to it, the concentration temperature is 75° C., and the cumene hydroperoxide concentration is obtained to be 50% by weight of the oxidation solution, and the residual water due to washing is also to a certain extent when concentration is carried out. above is removed. After processing, the organic acid weight content in the cumene hydroperoxide oxida...

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Abstract

The invention discloses a method for preparing cumene and the obtained cumene, the method is as follows: in the presence of a catalyst, a material containing alpha, alpha dimethyl benzyl alcohol is subjected to conversion treatment to obtain the cumene, and the content of metal ions in the material containing alpha, alpha dimethyl benzyl alcohol is below 10ppm. According to the invention, metal ions are mainly controlled to be beneficial to the long-term stability of the catalyst, so that the conversion rate of alpha, alpha-dimethyl benzyl alcohol is not obviously reduced after long-term operation of the catalyst.

Description

technical field [0001] The invention belongs to the preparation of cumene, in particular to the preparation of cumene in the process of preparing propylene oxide by CHP method. Background technique [0002] Propylene oxide (PO) is an important organic chemical raw material, mainly used in the production of polyether polyol, propylene glycol, propylene glycol ether, etc. At present, the commercial production methods of PO mainly include chlorohydrin method, co-oxidation method (PO / SM), cumene hydroperoxide cycle method (CHP), and hydrogen peroxide direct oxidation (HPPO). The production of propylene oxide by the CHP method is not affected by the price fluctuations of the co-products, and it has no pollution to the environment and less investment. It is an environmentally friendly and clean production process. It was first successfully developed by Sumitomo Chemical Company of Japan. The new process of producing PO with CHP as an oxidant includes There are cumene oxidation, p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C5/03C07C15/085
CPCC07C5/03C07C1/24C07C29/132C07C407/00C07C15/085C07C15/46C07C33/20C07C409/10Y02P20/52
Inventor 马文迪刘仲能赵多吕宇皓
Owner CHINA PETROLEUM & CHEM CORP