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Method for preparing methoxyacetone

A technology for methoxyacetone and methoxypropanol, which is applied in the field of catalytic oxidation of molecular sieves to prepare methoxyacetone, can solve the problems of high reaction temperature, large equipment investment, low conversion rate of raw materials, etc. mild conditions

Inactive Publication Date: 2019-12-20
CHINA CATALYST HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

3. Synthesis of methoxyacetone by dehydrogenation, the reaction needs to be carried out in a tubular reactor, the design and operation process of the reactor is complex, the investment in equipment is large, the reaction temperature is high, catalyst recovery is difficult, and the conversion rate of raw materials is low, so it is still There is room for improvement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add 18g of TS-1 catalyst and 90g of methoxy propanol to a 250ml jacketed reactor, heat up to 30°C in a circulating water bath, start to add 123.6g of 27.5% hydrogen peroxide dropwise, dropwise for 35min, keep warm for 3h, methoxy The conversion rate of propanol is 70.4%. The reaction solution was filtered, and the filtrate was rectified to obtain the product methoxyacetone with a yield of 63.1%.

Embodiment 2

[0017] Add 18g of TS-1 catalyst and 90g of methoxy propanol to a 250ml jacketed reactor, heat up to 40°C in a circulating water bath, start to add 123.6g of 27.5% hydrogen peroxide dropwise, drop for 35min, keep warm for 3h, methoxy The conversion rate of propanol is 72.3%. The reaction solution was filtered, and the filtrate was rectified to obtain the product methoxyacetone with a yield of 64.5%.

Embodiment 3

[0019] Add 18g of TS-1 catalyst and 90g of methoxypropanol to a 250ml jacketed reactor, heat up to 50°C in a circulating water bath, start to add 123.6g of 27.5% hydrogen peroxide dropwise, drop for 35min, keep warm for 3h, methoxy The conversion rate of propanol is 75.8%. The reaction solution was filtered, and the filtrate was rectified to obtain the product methoxyacetone with a yield of 60.9%.

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PUM

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Abstract

The invention discloses a method for preparing methoxyacetone. The method comprises the following steps: mixing methoxypropanol and a TS-1 catalyst, pouring an obtained mixture into a reaction kettlewith a jacket, heating to 30-50 DEG C in a circulating water bath, dropwisely adding hydrogen peroxide, keeping the temperature for 2-6 hours to obtain a reaction solution, filtering, and rectifying to obtain the pure methoxyacetone. The conversion rate of methoxypropanol in the reaction is greater than 70%, and the yield of methoxyacetone reaches 60%. TS-1 molecular sieve is adopted as catalystsin the reaction, and the method has the advantages of being environmentally friendly and simple in aftertreatment. The method has the advantages of mild reaction conditions, simple operation process and high product yield, and is suitable for industrial production.

Description

Technical field [0001] The invention relates to a method for preparing methoxyacetone, and in particular to a method for preparing methoxyacetone by catalytic oxidation of molecular sieves. Background technique [0002] Methoxyacetone is an important raw material in the synthesis of the low-toxic pesticide metolachlor. Metolachlor, as a low-toxic herbicide, has been widely used in dry fields in the north. As one of the important raw materials for the production of metolachlor, methoxyacetone has a broad market space. [0003] The synthesis method of methoxyacetone is mainly produced by oxidation using methoxypropanol as raw material. Currently, the synthesis methods reported in literature and patents are: 1. Sodium dichromate and other oxidants are used as raw materials to oxidize and synthesize methoxyacetone. Heavy metal chromium seriously pollutes the environment. 2. Hydrogen peroxide is used as an oxidant to oxidize methoxypropanol to synthesize methoxyacetone. The ca...

Claims

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Application Information

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IPC IPC(8): C07C45/29C07C49/175
CPCC07C45/294C07C49/175
Inventor 张恩锋王炳春王贤彬李进
Owner CHINA CATALYST HLDG CO LTD
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