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Alpha-methyl styrene selective hydrogenation method

A methylstyrene, selective technology, used in chemical instruments and methods, hydrogenation to hydrocarbons, metal/metal oxide/metal hydroxide catalysts, etc. to achieve good anti-interference performance and good low-temperature activity

Active Publication Date: 2014-11-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is the problems in the prior art that the catalyst has poor low-temperature activity, poor selectivity and stability when selectively hydrogenating α-methylstyrene, and provides a new α-methylstyrene A method for the selective hydrogenation of methyl styrene, especially for the hydrogenation of the by-product α-methylstyrene in the process of producing phenol / acetone in the cumene industry to convert it into raw material cumene. This method has high activity at low temperature , good selectivity and stability

Method used

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  • Alpha-methyl styrene selective hydrogenation method
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  • Alpha-methyl styrene selective hydrogenation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 300 grams of pseudo-boehmite and 9 grams of fennel powder, mix them, and then add 12 grams of polyvinyl alcohol solution (5% mass concentration), 4.0 grams of nitric acid, 2.2 grams of phosphoric acid with a concentration of 85%, potassium nitrate 2.3 grams, 270 milliliters of an aqueous solution of 12 grams of magnesium nitrate, extruded into a clover with a diameter of 2.5 mm, and the wet strip was dried at 50°C for 24 hours and then calcined at 1000°C for 4 hours to obtain the carrier Z1. Take 100 g of the carrier to pre-soak the carrier with deionized water, then drain the water, and place the carrier in 0.3L PdCl 2 Impregnation was carried out in the impregnation solution (the mass concentration of Pd was 1g Pd / L) until the impregnation solution was colorless, drained, dried at 120°C for 4 hours, and calcined at 450°C for 4 hours to obtain Pd-based catalyst C1. The catalyst composition, specific surface area and pore volume are shown in Table 1.

[0021] Tak...

Embodiment 2

[0024] Weigh 300 grams of pseudo-boehmite, 9 grams of scallop powder, mix, then add 12 grams of polyvinyl alcohol solution (5% mass concentration), 4.0 grams of nitric acid, 1.2 grams of barium nitrate, 0.1 grams of silver nitrate, 25 270 ml of aqueous solution of 120 g of silica sol, extruded into a clover with a diameter of 2.5 mm, dried at 90°C for 8 hours and then calcined at 900°C for 4 hours to obtain alumina carrier Z2. Take 100 g of the carrier, pre-soak the carrier with deionized water, then drain the water, and place the carrier in 0.5 L PdCl 2 Impregnation was carried out in the impregnation solution (the mass concentration of Pd was 1g Pd / L) until the impregnation solution was colorless, drained, dried at 120°C for 4 hours, and calcined at 450°C for 4 hours to obtain Pd-based catalyst C2. The catalyst composition, specific surface area and pore volume are shown in Table 1.

[0025] Take 100 ml of C2 catalyst and reduce it for 8 hours under the conditions of hydrog...

Embodiment 3

[0028]Weigh 300 grams of pseudo-boehmite, 9 grams of scallop powder, mix, then add 12 grams of polyvinyl alcohol solution (5% mass concentration), 4.0 grams of nitric acid, 9.0 grams of calcium nitrate, and 85% phosphoric acid 270 milliliters of 5.6 grams of aqueous solution was extruded into a clover with a diameter of 2.5 mm, and the wet strip was dried at 90° C. for 8 hours and then calcined at 1050° C. for 4 hours to obtain alumina carrier Z3. Take 100 g of the carrier, pre-soak the carrier with deionized water, then drain the water, and dissolve the carrier in 0.3 L PdCl 2 The impregnating solution (where the mass concentration of Pd is 0.5 g Pd / L) was impregnated until the impregnating solution was colorless, drained, dried at 120°C for 4 hours, and calcined at 450°C for 4 hours to obtain Pd-based catalyst C3. The catalyst composition, specific surface area and pore volume are shown in Table 1.

[0029] Take 100 ml of C3 catalyst and reduce it for 8 hours under the cond...

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Abstract

The invention relates to an AMS (Alpha Methyl Styrene) selective hydrogenation method which mainly solves the problems of poor low-temperature activity and bad selectivity and stability of a catalyst in the prior art. According to the technical scheme, the used catalyst comprises the following components in parts by weight: (a) 0.01-1.0 part of metal palladium or oxide thereof, (b) 0.01-2.0 parts of at least one element of IA or IIA selected from the periodic table of elements or oxide thereof, (c) 0.01-20.0 parts of at least one element of IVA or VA selected from the periodic table of elements or oxide thereof and (d) 77-100 parts of alumina carriers, so that the problems are better solved. The AMS selective hydrogenation method disclosed by the invention can be used for the industrial production of AMS selective hydrogenation.

Description

technical field [0001] The present invention relates to a method for the selective hydrogenation of α-methylstyrene, in particular to a method for converting the by-product α-methylstyrene used in the industrial phenol / acetone production process of cumene into raw materials through hydrogenation The cumene method. Background technique [0002] At present, the output of cumene in the world is nearly ten million tons, and more than 90% of cumene is used to produce phenol and acetone. The α-methylstyrene (AMS) hydrogenation to cumene project is a supporting technology for the production of phenol / acetone in the cumene industry. Hydrogen is converted into raw material cumene and returned to the oxidation process, thereby reducing the unit consumption of cumene, increasing the yield of phenol, saving raw material costs, etc., which can not only reduce the consumption of raw materials propylene and benzene, but also improve the technical economy of the device index. [0003] Th...

Claims

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Application Information

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IPC IPC(8): C07C15/085C07C5/03B01J27/185B01J23/56
CPCY02P20/52
Inventor 刘仲能江兴华顾国耀李则俊
Owner CHINA PETROLEUM & CHEM CORP
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