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A preparation method of propylene glycol monoalkyl ether

A technology for propylene glycol monoalkyl ether and propylene oxide, which is applied in the field of preparing propylene glycol monoalkyl ether, can solve the problems of poor catalyst stability, unsatisfactory isomer ratio, low product yield, etc., and achieves less equipment corrosion and reduced The effect of waste lye volume and high product yield

Active Publication Date: 2019-06-11
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defects such as poor catalyst stability, low product yield and unsatisfactory isomer ratio in the existing method for preparing propylene glycol monoalkyl ether, and provide a preparation method of propylene glycol monoalkyl ether. The method can obtain higher product yield and higher isomer ratio at the same time, and the catalyst has long service life and low production cost

Method used

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  • A preparation method of propylene glycol monoalkyl ether

Examples

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Effect test

Embodiment 1

[0039] The preparation method of the magnetic solid base catalyst used in the present invention.

[0040] The modified magnetic solid base catalyst is prepared by impregnation and roasting, and the specific steps are as follows:

[0041] 1. Preparation of magnetic core: 0.1mol NiSO 4 .6H 2 O and 0.1mol Fe 2 (SO 4 ) 3 , prepare a salt solution with de-carbonated deionized water, add 1.5mol / L NaOH solution to the above solution under nitrogen protection, the end point pH=7, crystallize in a water bath at 40°C for 4 hours, and then wash with deionized water for 2 hours Once, washed twice with ethanol, dried at 100°C for 5h to obtain the magnetic core precursor, then in the muffle furnace, the temperature was raised to 900°C at 10°C / min and kept for 2h, cooled to room temperature to obtain NiFe 2 o 4 . Take 10g of glucose, dissolve it completely in 150mL of water, add NiFe 2 o 4 , mixed with ultrasound for 20min, put the obtained suspension into a 200mL autoclave, and car...

Embodiment 2

[0048] 15 mL of catalyst 1 obtained in Example 1 was loaded into a stainless steel fixed-bed reaction. The reactor was a stainless steel tube with an inner diameter of 8 mm and a length of 1 m, and stainless steel fillers were filled at both ends of the catalyst. Raw material propylene oxide and methanol are metered into the reactor through advection pump. At 100°C, the reaction pressure is 1.0MPa, the molar ratio of alkanol to alkanes is 4, and the liquid space velocity of the reaction bed is 2.0h -1 . The obtained product was analyzed and determined by GC, and the conversion rate of propylene oxide was 99.1%, the selectivity of propylene glycol methyl ether was 97.0%, and the ratio of primary and secondary ether isomers was 98:2.

Embodiment 3～6

[0050] Compared with Example 2, the raw materials are still propylene oxide and methanol, and the catalyst and process conditions are changed. The experimental results are shown in the following table.

[0051]

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PUM

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Abstract

The invention discloses a preparation method of propylene glycol monoalkyl ether. Propylene oxide and alcohol are used as raw materials and react under the catalysis of a modified magnetic solid basecatalyst to prepare the propylene glycol monoalkyl ether. The catalyst is obtained by taking nickel ferrite as a magnetic core, magnesium-aluminum oxide as a carrier and cesium as an active componentthrough transition metal modification. The method improves the reaction activity and selectivity, and alleviates the operation conditions; and the catalyst is long in service lifetime, easy to recoverand regenerate and low in production product, overcomes various defects in the prior art, and can be used for industrial production.

Description

technical field [0001] The present invention relates to a method for preparing propylene glycol monoalkyl ether. technical background [0002] Alcohol ether compounds are one of the important industrial derivatives of epoxy compounds. They are fine chemical products with a wide range of uses. They are known as "universal solvents" and can be widely used in coatings, printing, dyes, cleaning agents, inks, in fragrances and cosmetics. Alcohol ether products are divided into two series: propylene glycol ether (P-series) and ethylene glycol ether (E-series). Historically, E-series alcohol ether products have dominated the market, but since 1982 the European chemical industry and toxicology Since the Center (E-CETOC) published the toxicity report on glycol ethers, propylene glycol ethers are gradually replacing glycol ethers because of their low toxicity and similar physical and chemical properties to glycol ethers. [0003] There are many synthetic routes of propylene glycol e...

Claims

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Application Information

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IPC IPC(8): C07C41/03C07C43/13B01J23/83B01J23/78
Inventor 赵晶李俊平张彦雨杜旺明牟通王漭付松王锐边新建陈海波黎源
Owner WANHUA CHEM GRP CO LTD
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