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Preparation method of isopropylbenzene and obtained isopropylbenzene

A technology for cumene and propylbenzene catalysts, which is applied in chemical instruments and methods, catalyst activation/preparation, and hydrocarbon production from oxygen-containing organic compounds, etc., can solve the problems of acetophenone hydrogenation, low selectivity of cumene, and catalyst Poor stability and other issues

Inactive Publication Date: 2021-03-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at problems such as poor catalyst stability, low selectivity of cumene and hydrogenation of acetophenone in the existing technology for preparing cumene, and provides a novel method for preparing cumene

Method used

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  • Preparation method of isopropylbenzene and obtained isopropylbenzene
  • Preparation method of isopropylbenzene and obtained isopropylbenzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Weigh 0.5gPdCl 2 and 2.5 g of glucose were dissolved in a prepared solution containing 10.0 g of concentrated hydrochloric acid, 5.0 g of citric acid and 100 g of water, and the pH value of the solution was adjusted to 3 with lye to obtain a Pd impregnation solution. Heat the impregnating solution to 80°C, weigh 25g of alumina carrier, immerse it in the Pd impregnating solution, stir it thoroughly for 10min, filter it, wash it with deionized water, dry it at 100°C for 12h, and place it in a muffle furnace (nitrogen atmosphere ) at 500°C for 4 hours to obtain catalyst A1. The main composition of catalyst A1 is shown in Table 1.

[0045] Weigh 20mL of catalyst and load it into the reactor. The catalyst is reduced at 150°C for 8h. The benzyl alcohol raw material contains 55.0wt.% α,α-dimethylbenzyl alcohol, 1.3wt.% acetophenone and 42.8wt.% iso Propylbenzene, reaction pressure 2.0MPa, inlet temperature 160°C, H 2 / benzyl alcohol molar ratio is 6.0, liquid space velocity ...

Embodiment 2

[0047] Weigh 0.5gPdCl 2 and 5.0 g of glucose were dissolved in a prepared solution containing 10.0 g of concentrated hydrochloric acid, 5.0 g of citric acid and 100 g of water, and the pH value of the solution was adjusted to 3 with lye to obtain a Pd impregnation solution. Heat the impregnating solution to 80°C, weigh 25g of alumina carrier, immerse it in the Pd impregnating solution, stir it thoroughly for 10min, filter it, wash it with deionized water, dry it at 100°C for 12h, and place it in a muffle furnace (nitrogen atmosphere ) at 500°C for 4 hours to obtain catalyst A2. The main composition of catalyst A2 is shown in Table 1.

[0048] Weigh 20mL of catalyst and load it into the reactor. The catalyst is reduced at 150°C for 8h. The benzyl alcohol raw material contains 55.0wt.% α,α-dimethylbenzyl alcohol, 1.3wt.% acetophenone and 42.8wt.% iso Propylbenzene, reaction pressure 2.0MPa, inlet temperature 160°C, H 2 / benzyl alcohol molar ratio is 6.0, liquid space velocity ...

Embodiment 3

[0050] Weigh 0.5gPdCl 2 Dissolve in a prepared solution containing 10.0 g of concentrated hydrochloric acid, 5.0 g of citric acid and 100 g of water, and adjust the pH value of the solution to 3 with lye to obtain a Pd impregnation solution. Heat the impregnating solution to 80°C, weigh 25g of alumina carrier and immerse it in the Pd impregnating solution, fully stir for 10min, filter and wash with deionized water, dry at 100°C for 12h, and then bake in a muffle furnace at 500°C for 4h , the vested intermediate A'3.

[0051] Weigh 5.0g of glucose and dissolve it in 20g of water, soak the intermediate A'3 in the aqueous glucose solution, let it stand for 6h, dry it at 100°C for 12h, and then bake it in a muffle furnace (nitrogen atmosphere) at 500°C for 4h to obtain the catalyst A3. The main composition of catalyst A3 is shown in Table 1.

[0052] Weigh 20mL of catalyst and load it into the reactor. The catalyst is reduced at 150°C for 8h. The benzyl alcohol raw material cont...

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Abstract

The invention provides a preparation method of isopropylbenzene and the obtained isopropylbenzene, and the preparation method comprises the following steps: step 1, loading a compound containing a metal active component and a carbon-containing precursor on an alumina carrier, and then conducting drying and roasting to obtain an isopropylbenzene catalyst; and step 2, in the presence of the isopropylbenzene catalyst, carrying out a reaction on an organic material containing alpha,alpha-dimethyl benzyl alcohol and hydrogen as raw materials to prepare the isopropylbenzene. The isopropylbenzene catalyst prepared in the step 1 contains residual carbon, the effect of passivating the catalyst is achieved, excessive hydrogenolysis hydrogenation of alpha,alpha-dimethyl benzyl alcohol and hydrogenation of acetophenone in an organic material can be inhibited in the reaction in the step 2, the isopropylbenzene selectivity is effectively improved, the ethylbenzene content in the product is controlled, the later separation cost is reduced, and the Pd-based catalyst has good stability in preparation of isopropylbenzene by hydrogenolysis of alpha,alpha-dimethylbenzyl alcohol, and has high industrial application value.

Description

technical field [0001] The invention relates to the preparation of cumene, in particular to a method for preparing cumene by hydrogenolysis of dimethyl benzyl alcohol. Background technique [0002] At the beginning of this century, Sumitomo Chemical Company developed a new process for producing PO with CHP as an oxidant, mainly including oxidation of cumene, epoxidation of propylene, recovery and refining of propylene and PO, hydrogenolysis of α,α-dimethylbenzyl alcohol and Separation of harmful impurities and other processes. The process has the following advantages: the conversion rate and selectivity of the whole process are very high; the product is only PO, there is no co-production product, and it is not affected by the price fluctuation of by-products, which can bring more stable economic benefits to the manufacturer; the process flow Compared with the co-oxidation method with ethylbenzene, it is relatively simple; and it has lower requirements for equipment anticorr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J37/02C07C1/22C07C15/085
CPCB01J23/44B01J37/0203C07C1/22C07C2523/44C07C15/085Y02P20/52
Inventor 吕宇皓刘仲能赵多马文迪王燕波林渊峰
Owner CHINA PETROLEUM & CHEM CORP
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