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Venturi mixer with porous annular cavity and application thereof in cyanohydrin synthesis

A Venturi mixer and annular cavity technology, which is applied in fluid mixers, mixers, chemical instruments and methods, etc., can solve the problems of high mainstream fluid flow rate, uneven mixing, and low mixing efficiency, and achieve high uniformity. Mixing degree, improve mixing effect, improve the effect of mixing

Active Publication Date: 2018-10-30
SHANDONG XINHECHENG AMINO ACID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (1) Avoid the problems of uneven mixing and low mixing efficiency caused by high mainstream fluid flow rate or large flow rate;

Method used

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  • Venturi mixer with porous annular cavity and application thereof in cyanohydrin synthesis
  • Venturi mixer with porous annular cavity and application thereof in cyanohydrin synthesis
  • Venturi mixer with porous annular cavity and application thereof in cyanohydrin synthesis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1 A kind of Venturi mixer containing porous annular cavity

[0043] The structure of the Venturi mixer is as figure 1 shown;

[0044]The Venturi mixer comprises a housing 1, a nozzle 2 arranged in the housing and an annular cavity 3 outside the housing;

[0045] The main fluid inlet 4 and the mixed fluid outlet 5 are respectively provided at both ends of the housing 1;

[0046] The constriction section 6 behind the outlet of the nozzle 2 is the mixed area of ​​the main fluid and the incoming fluid;

[0047] The annular chamber 3 is located outside the housing 1, and communicates with the interior of the housing 1 through the flow hole 7 on the housing 1; the vertical height of the upper surface of the annular chamber 3 from the Venturi mixer housing 1 is smaller than the inner diameter of the branch pipe 8 , the annular cavity 3 is located between the inlet and the outlet of the nozzle 2 and before the constriction section 6 .

[0048] The flow hole 7 is ...

Embodiment 2

[0056] Embodiment 2 Application of Venturi mixer in the synthesis of 3-methylthiopropionaldehyde

[0057] The reaction device for synthesizing 3-methylthiopropionaldehyde is as image 3 As shown, it is mainly composed of a reactor 9, a circulation pump 10, a Venturi mixer 11, a heat exchanger 12 and a mother liquor circulation pipeline 13.

[0058] The operating process of the reaction device for the synthesis of 3-methylthiopropionaldehyde of the present invention is that the methylmercaptan pipeline is directly introduced into the Venturi mixer 11 to mix with the mother liquor, and the circulation pump 10 provides the power of the forced circulation loop, and the methylmercaptan and the mother liquor Continue to mix in the mother liquid circulation line 13, then enter the reactor 9 for reaction, and the heat exchanger 12 takes away the heat generated by the reaction.

[0059] The diameter of the mother liquid circulation pipeline 13 is 350mm, the diameter of the Venturi mai...

Embodiment 3

[0062] Application of embodiment 3 Venturi mixer in cyanohydrin preparation process

[0063] In another form of the present invention, 3-methylthiopropionaldehyde is mixed with hydrogen cyanide gas to react to generate cyanohydrin. Hydrocyanic acid gas enters from the branch pipe. The diameter of the branch pipe 8 is 50 mm, and four flow holes 7 with a diameter of 10 mm are evenly distributed on the circumference, connecting the annular cavity 3 and the inside of the Venturi tube shell. The outlet diameter of the nozzle 2 is 65 mm, the diameter of the mixing chamber 15 is 89 mm, and the length is 230 mm.

[0064] All the other parameters are the same as in Example 2.

[0065] In order to test the mixing effect of the Venturi mixer, CFD simulation was carried out on the Venturi tube. The simulation results show that the main fluid flow rate is 1200m with the addition of the Venturi tube in the annular cavity 3 / h, the overall pressure drop is 0.44MPa, the degree of mixing r...

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Abstract

The invention provides a Venturi mixer with a porous annular cavity. The Venturi mixer comprises a shell 1, a nozzle 2 and an annular cavity 3, wherein the nozzle 2 is arranged inside the shell; the annular cavity 3 is formed outside the shell; the annular cavity 3 is communicated with the interior of the shell 1 through multiple communication holes 7 in the shell 1. The invention further providesapplication of the Venturi mixer with the porous annular cavity in cyanohydrin synthesis. The Venturi mixer has the advantages that due to addition of the annular cavity in the Venturi mixer, mixingsituations of a main fluid and an introduced fluid near a central line are improved, a boundary layer of a mixed fluid is damaged, speed distribution of a fluid cross section is improved, problems ofnon-uniform mixing and low mixing efficiency caused by high main fluid velocities or large introduced fluid flows can be avoided, and in addition, the Venturi mixer is applicable to flow proportioningof introduced fluids and main fluids of a large range, and in addition has a very good mixing effect.

Description

technical field [0001] The invention relates to the technical field of Venturi mixers, in particular to a Venturi mixer with a porous annular cavity and its application in synthesizing cyanohydrin. Background technique [0002] As an important gas-liquid or liquid-liquid mixing device, the Venturi mixer is widely used in engineering practice. The common Venturi mixer is a classic Venturi tube with a throat opening. The mainstream fluid is composed of classic The Venturi tube flows through, and the incoming fluid flows in through a single opening. The pressure change of the two fluids is used to mix the incoming fluid with the mainstream fluid, and the turbulent flow formed by the two high-speed fluids is used to achieve the purpose of mixing. [0003] A device for causticizing caprolactam is disclosed in CN102335573, wherein a Venturi mixer is used for material mixing, and the Venturi mixer includes a Venturi tube, 2 to 16 ammonia gas nozzles, annular ammonia gas distributio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F5/04B01J19/00C07C323/12C07C319/20C07C319/18C07C323/22
CPCB01J19/00C07C319/18C07C319/20B01F25/312B01F25/31242C07C323/22C07C323/12
Inventor 王志轩张玉玺陈聪
Owner SHANDONG XINHECHENG AMINO ACID
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