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A continuous production process for the direct dehydrogenation of 1-methoxy-2-propanol to synthesize 1-methoxy-2-propanone

A production process, methoxy technology, applied in the field of synthesis of methoxy acetone, can solve the problems of poor selectivity, hydrogen cannot be recycled and reused

Active Publication Date: 2020-08-14
CHINA CATALYST HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To overcome the defects in the prior art, such as introducing carrier gas (air, oxygen) into the reaction, poor selectivity, and the hydrogen generated cannot be recycled and reused.

Method used

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  • A continuous production process for the direct dehydrogenation of 1-methoxy-2-propanol to synthesize 1-methoxy-2-propanone
  • A continuous production process for the direct dehydrogenation of 1-methoxy-2-propanol to synthesize 1-methoxy-2-propanone
  • A continuous production process for the direct dehydrogenation of 1-methoxy-2-propanol to synthesize 1-methoxy-2-propanone

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Experimental program
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Effect test

preparation example Construction

[0026] The preparation process of the dehydrogenation catalyst is as follows: 100g tetraethyl orthosilicate, 100g ethanol, 200g deionized water and 29.1g copper nitrate trihydrate are mixed evenly at 35°C, and stirred vigorously for 8 hours; 14.53g magnesium nitrate hexahydrate, 0.98 1 g of anhydrous potassium nitrate was dissolved in 100 g of deionized water and added dropwise to the above mixture, aged at 50°C for 18 hours to form a gel, dried at 100°C for 16 hours, calcined at 500°C for 6 hours, and then dried at 220°C It was reduced in a hydrogen atmosphere at high temperature for 6h to obtain a dehydrogenation catalyst.

[0027] The catalyst active components are copper: 25.4wt%, magnesium: 2.5wt%, calcium: 1.25wt%, potassium 1.0wt%, and the rest is silicon dioxide.

Embodiment 1

[0029] Add 50g of dehydrogenation catalyst to the middle of the reactor, and add 6mm glass ceramic balls up and down (the reactor standard is DN25 stainless steel tube, length 1200mm). 2h at liquid space velocity -1 1-methoxy-2-propanol is preheated to 220°C in the preheater, and then enters the reactor for dehydrogenation reaction (the reactor temperature is controlled at 220°C), and the reaction liquid and hydrogen GC are obtained. Chromatographic detection, continuous operation for 30 days, no significant change in detection results, stable response. The monthly average results are shown in Table 2.

Embodiment 2

[0031] Add 50g of dehydrogenation catalyst to the middle of the reactor, and add 6mm glass ceramic balls up and down (the reactor standard is DN25 stainless steel tube, length 1200mm). 2h at liquid space velocity -1 1-methoxy-2-propanol is preheated to 230°C in the preheater, and then enters the reactor for dehydrogenation reaction (the reactor temperature is controlled at 230°C), and the reaction liquid and hydrogen GC are obtained. Chromatographic detection, continuous operation for 30 days, no significant change in detection results, stable response. The monthly average results are shown in Table 2.

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PUM

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Abstract

The invention discloses a continuous production process for directly dehydrogenating 1-methoxy-2-propanol to synthesize 1-methoxy-2-acetone. The 1-methoxy-2-propanol is preheated and vaporized by a preheater, and then enters a fixed-bed reactor filled with a catalyst, and performs a dehydrogenation reaction under the action of a dehydrogenation catalyst. At a reaction temperature of 220-350°C, a reaction pressure of 0-1.0Mpa, and a mass space velocity of 0.5-6h ‑1 Under these conditions, 1-methoxy-2-propanol is directly dehydrogenated to generate 1-methoxy-2-acetone, the conversion rate of raw materials can reach more than 70%, and the selectivity of 1-methoxy-2-acetone can reach More than 98%. Since no additional carrier gas and oxidant are needed in this process, there is no deep oxidation problem in the reaction process, and the hydrogen generated can be compressed and recycled after gas-liquid separation. In addition, it also improves the safety and reliability of the entire process technology and reduces potential safety hazards in the process.

Description

technical field [0001] The invention belongs to a synthesis method of organic compounds, and relates to a synthesis method of methoxyacetone. Background technique [0002] 1-Methoxy-2-propanone is an important fine chemical product, mainly used as a synthetic raw material for the pesticide metolachlor and some medicines. As a low-toxic herbicide, metolachlor has been widely used in northern China of dry fields. As one of the important raw materials for the production of metolachlor, 1-methoxy-2-propanone has a broad market space. [0003] U.S. Patent US 3462495 discloses that a mixture of 1-methoxy-2-propanol and water enters the reactor after preheating, and the phosphate catalyst of loading Ca-Ni in the reactor, under certain conditions, 1-methoxy The conversion rate of -2-propanol is 55%, but this catalyst is very easy to deactivate and needs to be regenerated every hour. [0004] Patent CN 01131292.0 discloses a method for preparing a catalyst for 1-methoxy-2-propanon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C45/00C07C49/175B01J23/78B01J37/08B01J37/18B01J37/03
Inventor 李进王庆吉王建青王炳春孙心鹏
Owner CHINA CATALYST HLDG CO LTD
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