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Isopropylbenzene recycling method in epoxypropane preparation process

A technology of propylene oxide and cumene, applied in the field of propylene oxide preparation, can solve the problems of excessive Na residue, influence on epoxidation strength, consumption of sodium hydroxide, etc. The effect of preventing the loss and sintering of metal components and improving the adsorption effect

Pending Publication Date: 2021-02-02
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the circulation of cumene, the hydrogenolysis process will generate organic acids and gradually accumulate in the reaction system. The organic acids will lead to PO ring opening in the epoxidation process and increase the content of heavy components in the hydrogenolysis process. , which in turn affects the selectivity of PO in the epoxidation reaction and the selectivity and yield of cumene in the hydrogenolysis reaction
At present, in industrial production, alkaline washing and water washing are mainly used to remove organic acids in the system, which not only consumes sodium hydroxide, but also produces a large amount of Na-containing wastewater.
At the same time, if the alkali cleaning effect decreases, the Na residue in the system will exceed the standard, which will affect the epoxidation strength, cause the catalyst to be broken, the pressure drop will increase, and the device will stop abnormally.

Method used

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  • Isopropylbenzene recycling method in epoxypropane preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Preparation of Catalyst I.

[0043] 1) 97.5gZrO 2 The carrier was impregnated in 200ml aqueous solution containing 1.33g of chloroplatinic acid, and impregnated under reflux at 60°C for 2h; no chlorine was detected after washing and filtering 4 times, dried at 110°C for 2h, and calcined at 300°C for 4h to obtain an intermediate product.

[0044]2) Put the intermediate product in the electrolytic cell, pass 2g of Ag through the electrolytic cell, the current density is 1A, 50ml / min nitrogen gas is passed through the deposition process, the deposition time is 3h, and the type I catalyst is obtained after roasting at 300°C for 4h.

Embodiment 2

[0046] Preparation of Catalyst II.

[0047] 1) 97.5gZrO 2 The carrier was impregnated in 200ml aqueous solution containing 0.84g palladium chloride, refluxed at 60°C for 2h; washed and filtered 5 times, dried at 110°C for 2h, and calcined at 300°C for 4h to obtain an intermediate product.

[0048] 2) Put the intermediate product in the electrolytic cell, pass 2g of Ag through the electrolytic cell, the current density is 0.5A, 50ml / min nitrogen gas is passed through the deposition process, the deposition time is 3h, and the type II catalyst is obtained after roasting at 300°C for 4h .

Embodiment 3

[0050] Preparation of Catalyst III.

[0051] 1) 97.5gZrO 2 The carrier was impregnated in 200ml aqueous solution containing 19.5g of nickel nitrate hexahydrate, and impregnated under reflux at 60°C for 2h; after washing and filtering 5 times, it was dried at 110°C for 2h, and calcined at 300°C for 4h to obtain an intermediate product.

[0052] 2) Put the intermediate product in the electrolytic cell, pass 2g of Ag through the electrolytic cell, the current density is 0.5A, 50ml / min nitrogen gas is passed through the deposition process, the deposition time is 3h, and after calcination at 300°C for 4h, a type III catalyst is obtained .

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Abstract

The invention relates to an isopropylbenzene recycling method in an epoxypropane preparation process. The method comprises the following steps: in the PO preparation process, cumene is reduced into crude cumene again through oxidation, epoxidation and hydrogenolysis reactions; the crude isopropylbenzene is introduced into a low-carbon organic acid decomposition reactor, and the low-carbon organicacid in the crude isopropylbenzene is catalytically decomposed into CO and water; and CO is introduced back into the hydrogenolysis reactor. The low-carbon organic acid is decomposed so that the selectivity of PO in the epoxidation reaction and the yield of isopropyl benzene in the hydrogenolysis reaction can be improved; CO is introduced back to the hydrogenolysis reactor so that the generation of benzene ring hydrogenation products can be effectively reduced, the yield of isopropylbenzene is increased, and the separation energy consumption of isopropylcyclohexane and isopropylbenzene is further reduced.

Description

technical field [0001] The invention belongs to the field of propylene oxide preparation, and in particular relates to a method for recycling cumene in the process of preparing propylene oxide. Background technique [0002] Propylene oxide (PO) is an important organic chemical raw material, and its yield is second only to polypropylene among propylene derivatives. Propylene oxide is mainly used in the production of polyether polyols, propylene glycol and various nonionic surfactants, among which polyether polyols are important raw materials for the production of polyurethane foams, insulation materials, elastomers, adhesives and coatings, and various Nonionic surfactants are widely used in petroleum, chemical, pesticide, textile, daily chemical and other industries. [0003] The cumene peroxide (CHP) method is a new process for preparing PO, which was developed by Sumitomo Chemical Company in Japan at the beginning of this century and industrialized in Chiba, Japan. At pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D301/19C07D303/04B01J23/50B01J23/89
CPCC07D301/19C07D303/04B01J23/50B01J23/892Y02P20/52
Inventor 詹吉山沙宇李作金于海波孙康初乃波黎源
Owner WANHUA CHEM GRP CO LTD
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