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Preparation method and application of isopropylbenzene

A technology of cumene and reaction temperature, which is applied in the field of cumene preparation, can solve the problems of unstable downstream process operation and poor product quality, and achieve the effects of wide application value, excellent performance, and improved device operation stability

Pending Publication Date: 2021-04-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the defects of the prior art, the present invention provides a preparation method of cumene, which adopts α, α-dimethylbenzyl alcohol hydrogenolysis to prepare cumene, which mainly solves the problems in the cumene production technology existing in the prior art. The resulting cumene product contains impurities such as isopropylcyclohexane, α, α-dimethylbenzyl alcohol, α-methylstyrene and cumene, which causes unstable downstream process operation and poor product quality technical issues

Method used

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  • Preparation method and application of isopropylbenzene
  • Preparation method and application of isopropylbenzene
  • Preparation method and application of isopropylbenzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] 1. Catalyst preparation

[0090] a. Catalyst preparation in the first catalyst bed

[0091] Mix 1 liter of alumina carrier with 2000 g of palladium-containing 3.0 g of chloropalladium acid aqueous solution, dry at 110° C. for 8 hours, and roast at 450° C. for 4 hours to obtain oxidized palladium-based catalyst precursor I. The above-mentioned oxidized palladium-based catalyst precursor I was reduced with hydrogen for 4 hours, the reduction temperature was 300°C, and the hydrogen volume space velocity was 100 hours -1 , to obtain a palladium-based catalyst, and the specific composition of the catalyst is shown in Table 2.

[0092] b. Catalyst preparation for the second catalyst bed

[0093] Mix 1 liter of alumina carrier with 2,000 grams of chloropalladic acid-nickel nitrate aqueous solution containing 3.0 grams of palladium and 0.3 grams of nickel, dry at 110°C for 8 hours, and roast at 550°C for 4 hours to obtain the oxidized palladium-based catalyst precursor I. T...

Embodiment 2

[0109] 1. Catalyst preparation

[0110] a. Catalyst preparation in the first catalyst bed

[0111] Mix 1 liter of alumina carrier with 2000 g of palladium-containing 3.0 g of chloropalladium acid aqueous solution, dry at 110° C. for 8 hours, and roast at 450° C. for 4 hours to obtain oxidized palladium-based catalyst precursor I. The above-mentioned oxidized palladium-based catalyst precursor I was reduced with hydrogen for 4 hours, the reduction temperature was 300°C, and the hydrogen volume space velocity was 100 hours -1 , to obtain a palladium-based catalyst, and the specific composition of the catalyst is shown in Table 2.

[0112] b. Catalyst preparation for the second catalyst bed

[0113] Mix 1 liter of alumina support with 2000 g of chloropalladic acid-nickel nitrate-magnesium nitrate aqueous solution containing 3.0 g of palladium, 0.2 g of nickel and 0.1 g of magnesium, dry at 110°C for 8 hours, and bake at 550°C for 4 hours to prepare Oxidized palladium-based cat...

Embodiment 3

[0129] 1. Catalyst preparation

[0130] a. Catalyst preparation in the first catalyst bed

[0131] Mix 1 liter of alumina carrier with 2000 g of palladium-containing 3.0 g of chloropalladium acid aqueous solution, dry at 110° C. for 8 hours, and roast at 450° C. for 4 hours to obtain oxidized palladium-based catalyst precursor I. The above-mentioned oxidized palladium-based catalyst precursor I was reduced with hydrogen for 4 hours, the reduction temperature was 300°C, and the hydrogen volume space velocity was 100 hours -1 , to obtain a palladium-based catalyst, and the specific composition of the catalyst is shown in Table 2.

[0132] b. Catalyst preparation for the second catalyst bed

[0133] Mix 1 liter of alumina carrier with 2,000 grams of chloropalladic acid-copper nitrate aqueous solution containing 3.0 grams of palladium and 0.3 grams of Cu, dry at 110°C for 8 hours, and calcinate at 550°C for 4 hours to obtain the oxidized palladium-based catalyst precursor I. T...

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Abstract

The invention provides a preparation method of isopropylbenzene, the obtained isopropylbenzene and application, the preparation method comprises the following steps: taking a hydrocarbon material containing alpha, alpha-dimethyl benzyl alcohol and hydrogen as raw materials, and obtaining the isopropylbenzene through a first catalyst bed layer and a second catalyst bed layer which are connected in series; wherein the catalyst filling amount of the first catalyst bed layer is larger than that of the second catalyst bed layer, the reaction temperature of the first catalyst bed layer is lower than that of the second catalyst bed layer, and the liquid phase volume space velocity is higher than that of the second catalyst bed layer. The method provided by the invention realizes high-activity and high-selectivity conversion of alpha, alpha-dimethyl benzyl alcohol to prepare isopropylbenzene, and improves the operation stability of the device and the quality of isopropylbenzene; and the obtained isopropylbenzene product is low in impurity content and excellent in performance, achieves a better technical effect, and has wide industrial utilization value.

Description

technical field [0001] The invention relates to the preparation of cumene, in particular to the preparation of cumene by hydrogenolysis of α,α-dimethylbenzyl alcohol. Background technique [0002] Propylene oxide (PO) is an important organic chemical raw material, mainly used in the production of polyether polyols, propylene glycol, propylene glycol ether, etc., of which polyether polyols account for about 70% of the consumption. At present, the commercial production methods of PO mainly include chlorohydrin method, co-oxidation method (PO / SM) and cumene peroxide cycle method (CHP). The process has the following advantages: the conversion rate and selectivity of the whole process are very high; the product is only PO, which is not affected by the price fluctuation of the by-product styrene, and can bring more stable economic benefits to the manufacturer; the process is relatively simple, The fixed investment is 1 / 3 lower than that of the PO / SM method, and the CHP process ha...

Claims

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Application Information

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IPC IPC(8): C07C1/20C07C15/085C07D303/04C07D301/19C07D301/32C07C407/00C07C409/10B01J23/44B01J23/89B01J27/185
CPCY02P20/52
Inventor 刘仲能赵多马文迪吕宇皓顾国耀王燕波
Owner CHINA PETROLEUM & CHEM CORP