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Method for synthesizing acrolein

一种合成方法、丙烯醛的技术，应用在化学仪器和方法、混合机、流态混合器等方向，能够解决加长混合的时间、不易多层状的流动、得不到混合性等问题，达到改善混合性、混合性改善、压力降低的效果

Inactive Publication Date: 2011-07-20
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the number of introduction pipes is small, even if a high mixing property is obtained with a thin pipe with a mixing pipe diameter on the order of mm, in a tank of commercial equipment with a mixing pipe diameter of about tens of thousands of t / y on the order of 10 cm, not getting enough mixing
[0006] In addition, in the high-temperature and high-pressure micro-stirrer described in Patent Document 2, the first reaction liquid is introduced into the central axis of the mixing pipe, and two introduction pipes for the second reaction liquid are provided at offset positions from the central axis. Formation of multi-layered flow, prolonging the time for mixing

Method used

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  • Method for synthesizing acrolein
  • Method for synthesizing acrolein
  • Method for synthesizing acrolein

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no. 1 approach

[0076] The process of selecting glycerin as a raw material, selecting supercritical water as water, mixing them to start a reaction, separating and removing by-products, and recovering a reaction liquid will be described below with reference to the accompanying drawings.

[0077] figure 2 It is a figure which shows one embodiment of the acrolein synthesis apparatus used in this invention. First, use the supercritical water high-pressure pump 110 to deliver water at 35 MPa, and use the supercritical water preheater 120 to raise the temperature to 500°C. In addition, the raw material composed of glycerin and dilute sulfuric acid is transported at 35 MPa by the raw material high-pressure pump 210, heated to 250°C by the raw material preheater 220, mixed by the reaction devices 300a and 300b using swirling flow, and instantly heated at 400°C and 35MPa. The acrolein synthesis reaction starts.

[0078] image 3 A perspective view showing the reaction device of the present invent...

no. 2 approach

[0091] Figure 9 It is a perspective view of one embodiment of the reaction apparatus of the present invention using a swirling flow, Figure 10 Indicates its front view and top view. In the case of a small reaction device in which the inner diameter of the mixing channel 320 is 1 cm or less, eight first and second inlet channels 310X and 310Y cannot be connected. In the reaction device of this embodiment, a total of four first inlet channels 310X and second inlet channels 310Y are alternately connected so as to be rotated by 90° around the central axis of the mixing channel 320 . It should be noted that, although not shown in the figure, the total number of first and second inlet channels 310X, 310Y may be six. Compared with the conventional T-shaped tube and the reaction device using two swirling flows in the inlet flow path, the mixing property can be improved.

no. 3 approach

[0093] Figure 11 It is a perspective view of one embodiment of the reaction apparatus of the present invention using a swirling flow, Figure 12 Indicates its front view and top view. In the reaction device of this embodiment, the end of the cylindrical mixing channel 320 is sealed, and the sealed end is connected to the first inlet channel 310X and the second inlet channel 310Y, and the first inlet channel 310X The second inlet channel 310Y is used to introduce the fluid containing glycerin into the mixing channel 320 , and the second inlet channel 310Y is used to introduce the fluid including supercritical water into the mixing channel 320 . The first inlet channel 310X and the second inlet channel 310Y are connected to the mixing channel 320 in a state offset by δ from the central axis of the mixing channel 320 . In addition, a plurality of the first inlet channel 310X and the second inlet channel 310Y are provided at intervals along the flow direction of the mixing chan...

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Abstract

An object of the present invention is to provide a method for commercially manufacturing acrolein in a large flow rate by making supercritical water and an acid interact with glycerin, wherein by efficiently mixing high-concentration glycerin and supercritical water with each other, the method is made capable of making the synthesis stably proceed with a high yield while the occlusion and abrasion of the pipes and devices due to the generation of by-products are being suppressed. The method for synthesizing acrolein of the present invention is a method for synthesizing acrolein by making supercritical water and an acid interact with glycerin, the method using a reaction apparatus including: a cylindrical mixing flow path for mixing a fluid including glycerin and a fluid including supercritical water with each other; a first inlet flow path, disposed offset from the central axis of the mixing flow path, for making the fluid including glycerin flow into the mixing flow path; and a second inlet flow path, disposed offset from the central axis of the mixing flow path, for making the fluid including supercritical water flow into the mixing flow path, wherein the first inlet flow path and the second inlet flow path are each provided in a plurality of numbers in such a way that the first inlet flow paths and the second inlet flow paths are alternately arranged so as to encircle the central axis of the mixing flow path.

Description

technical field [0001] The present invention relates to a method for synthesizing an organic substance using supercritical water. More specifically, it relates to a method for synthesizing acrolein, which is a raw material of 1,3-propanediol, from glycerin in the presence of protons. Background technique [0002] 1,3-Propanediol is a raw material for high-quality polyester fibers such as polytrimethylene terephthalate, and therefore demand has increased in recent years. As one of the synthesis methods of 1,3-propanediol, there is the acrolein hydration and hydrogenation method described in Non-Patent Document 1. This method, established as an industrial production method, produces 1,3-propanediol by hydrating and hydrogenating acrolein obtained by air-oxidizing propylene, which is a petroleum raw material, in the presence of a catalyst. However, due to the increase in the price of crude oil in recent years, the development of a synthesis method from biological raw materials...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C47/22C07C45/29
CPCB01F5/0682B01F5/0688C07C45/52B01F5/0057C07D307/48B01F5/0615Y02P20/54B01F25/10B01F25/43141B01F25/45B01F25/4521C07C47/22
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伊藤博之白石朋史河村勉冈本成恭
Owner HITACHI LTD
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