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Manufacturing method of acrolein

A manufacturing method and technology of acrolein, applied in chemical instruments and methods, preparation of organic compounds, preparation of carbon-based compounds, etc., can solve problems such as increased equipment costs, reduce operating costs, reduce equipment costs, and reduce the number of machines Effect

Inactive Publication Date: 2013-08-14
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since this process is also a gas phase reaction, three towers including the cooling condensation tower are required, and the equipment cost increases
Also, since the water is eventually brought to the distillation column, energy is required to heat the water

Method used

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  • Manufacturing method of acrolein
  • Manufacturing method of acrolein
  • Manufacturing method of acrolein

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Embodiment Construction

[0045] Hereinafter, the process of the present invention for synthesizing acrolein from glycerin with supercritical water and distilling and refining it will be described with reference to the drawings, but the present invention is not limited to these embodiments.

[0046] First, according to Figure 4 , the process of synthesizing acrolein from purified glycerin by supercritical water treatment will be described. The purified glycerin, concentrated sulfuric acid, and water are supplied from respective headers (refined glycerin header 120 , sulfuric acid header 121 , and water header 122 ) to the raw material tank 123 , and are adjusted to a predetermined concentration by stirring and mixing. The raw material is supplied as a liquid at 35 MPa by the raw material high-pressure pump 125 , and the temperature is raised to 250° C. by the raw material preheater 126 . In addition, the ultrapure water stored in the water tank 111 is supplied by a supercritical water high-pressure p...

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Abstract

The present invention discloses a manufacturing method of acrolein. The present invention provides the manufacturing method of acrolein, which can simplify equipment for refining process of acrolein and reduce necessary energy required for refining in a process for causing reaction of supercritical Water and synthesizing acrolein from glycerin. The manufacturing method of the acrolein is characterized by comprising the following steps: causing the supercritical water and sulfuric acid to react on glycerin; performing cooling and decompression on the obtained reaction liquid; feeding the reaction liquid to a first distillation tower; recycling sulfuric acid, glycerin and water as high-boiling-point components at the bottom of the first distillation tower; recycling acrolein, acetaldehyde and formaldehyde as low-boiling-point components at top of the distillation tower; condensing the low-boiling-point components and feeding condensate to a second distillation tower; recycling the acetaldehyde and the formaldehyde as the low-boiling-point components at the top of the second distillation tower; and recycling the acrolein as the high-boilding-point component at the tower bottom.

Description

technical field [0001] The present invention relates to a method for producing acrolein. Background technique [0002] Since 1,3-propanediol is a raw material of high-quality polyester fibers represented by polytrimethylene terephthalate, the demand has increased in recent years. As one of the synthesis methods of 1,3-propanediol, there is the acrolein hydration / hydrogenation method shown in (Non-Patent Document 1). This is a method of producing 1,3-propanediol by air oxidation of propylene, which is a petroleum raw material, in the presence of a catalyst, hydration and hydrogenation of the obtained acrolein, and has been established as an industrial production method. However, from the viewpoint of recent separation from petroleum, the development of a synthesis method using biological raw materials is desired. [0003] The inventors of the present invention have developed a process of synthesizing 1,3-propanediol from glycerin waste by-produced in the production process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C47/22C07C45/82C07C45/52
CPCY02P20/54
Inventor 近藤健之上川将行冈宪一郎松尾俊明丹藤顺志佐世康成
Owner HITACHI LTD
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