Catalyst for preparing 1,4-butanediol from dimethyl maleate

A dimethyl maleate and catalyst technology, applied in the field of hydrogenation catalysts, can solve the problems of easy aggregation of active metals, influence on catalyst activity and product conversion rate, limited loading of active metals, etc., and increase the roasting temperature and heating rate , Overcoming the effects of mechanical shaping and small catalyst particles

Active Publication Date: 2021-07-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the catalyst is prepared by impregnation, the active metals are easy to aggregate, and the loading of active metals is limited, which affects the activity of the catalyst and the conversion rate of the product.

Method used

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  • Catalyst for preparing 1,4-butanediol from dimethyl maleate
  • Catalyst for preparing 1,4-butanediol from dimethyl maleate
  • Catalyst for preparing 1,4-butanediol from dimethyl maleate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Weigh 230.1g Cu(NO 3 ) 2 . 3H 2 O, 62.9g Zn(NO 3 ) 2 . 6H 2 0 and 12g polyethylene glycol, mixed with 200mL solution;

[0049] (2) Weigh 100g of self-made alumina carrier (specific surface 272, pore volume 0.97);

[0050] (3) Weigh 90mL solution to impregnate the alumina carrier for one stage. After impregnation, the catalyst is dried at 120°C for 4 hours, then weigh 46mL solution for two stage impregnation. After impregnation, the catalyst is dried at 115°C for 5 hours, and finally Weigh 26mL solution for three-stage impregnation. After impregnation, the catalyst is dried at 115°C for 5 hours; after drying, it is roasted. The heating rate is 1.5°C / min at 0-130°C and 0.7°C at 130-180°C. ℃ / min, the heating rate of 180~260℃ is 5℃ / min, the heating rate of 260~500℃ is 2.5℃ / min, and the temperature is kept at 500℃ for 3 hours to obtain the catalyst precursor a1. The properties are shown in Table 1.

Embodiment 2

[0052] Other conditions are the same as in Example 1, except that the quality of polyethylene glycol in the prepared solution is 8g. During the catalyst roasting process, the heating rate at 0~130°C is 1.7°C / min, and the heating rate at 130~180°C is 1.0°C / min. The heating rate at 260 °C was 5.9 °C / min, and the heating rate at 260-500 °C was 2.5 °C / min. The catalyst precursor a2 was obtained, and the catalyst A2 was obtained by tablet molding. Its physical and chemical properties are shown in Table 1.

Embodiment 3

[0054] Other conditions are the same as in Example 1, except that the quality of polyethylene glycol in the prepared solution is changed to 14g. During the catalyst roasting process, the heating rate at 0~130°C is 1.5°C / min, and the heating rate at 130~180°C is 0.8°C / min. The heating rate was 5.0 °C / min from 180 to 260 °C, and 2.7 °C / min from 260 to 500 °C to obtain the catalyst precursor a3, and the catalyst A3 was obtained by tablet molding. Its physical and chemical properties are shown in Table 1.

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Abstract

The invention provides a catalyst for preparing 1,4-butanediol from dimethyl maleate, which comprises 30% to 55% of aluminum oxide, 30% to 60% of copper oxide and 5% of M oxide in mass fraction ~20%; M is at least one of the metals zinc, manganese and magnesium; the catalyst is an aggregated shaped body of particles with the following particle size distribution: less than 20μm 1%~9%, 20~50μm 65%~90% and greater than 50μm 6%~25%. The catalyst is prepared by placing the molded alumina carrier in an impregnating solution for immersion, drying, primary roasting, molding, and secondary roasting. The impregnating solution contains metal nitrate and an organic complexing agent. In the present invention, metal nitrate decomposes and releases gas during the roasting process to realize catalyst particle size shaping, and the organic complexing agent can also play a dispersing role to realize a concentrated and uniform catalyst particle size distribution; the catalyst particle size can also be adjusted by controlling the heating rate of each temperature section . The catalyst of the invention is used in the reaction of preparing 1,4-butanediol from dimethyl maleate, and has higher activity and selectivity.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a hydrogenation catalyst, in particular to a hydrogenation catalyst used for selective hydrogenation of dimethyl maleate to prepare 1,4-butanediol. Background technique [0002] 1,4-Butanediol is a widely used basic organic chemical and fine chemical raw material, mainly used in the production of tetrahydrofuran, polydibutyl terephthalate (PBT), γ-butyrolactone and polyurethane (PU ). In recent years, due to the rapid growth of demand for thermoplastic elastic fibers and elastomers, the demand for monomers PTMEG (polytetramethylene ether glycol) and PTMG (polytetrahydrofuran ether) is strong, making the upstream raw material 1,4-butanediol Demand is also growing rapidly, and major 1,4-butanediol producers in the world, such as BASF and SISAS, have expanded their capacity one after another. [0003] There are many kinds of process routes for producing 1,4-b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/72B01J23/80B01J23/889C07C29/17C07C31/20
CPCB01J23/78B01J23/80B01J23/8892B01J35/0066B01J35/023B01J35/1061B01J37/0203B01J37/024B01J37/086B01J37/088C07C29/177C07C31/207
Inventor 付秋红段日包洪洲张艳侠
Owner CHINA PETROLEUM & CHEM CORP
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