Preparation device and preparation method of cyanohydrin

A preparation device and technology for cyanohydrin, applied in the field of liquid-liquid phase reaction, can solve the problems of difficult to control the radial temperature of a tubular reactor, difficult continuous production, uneven radial concentration, etc., and achieve accurate reaction residence time , The effect of increasing the radial temperature uniformity and controlling the reaction residence time

Active Publication Date: 2017-10-13
SHANDONG XINHECHENG AMINO ACID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In CN103664720, use hydrocyanic acid mixed gas to react to avoid the excessive use of hydrocyanic acid, but the reaction steps are complex and have both increased the difficulty of control in the reaction process, and at the same time, feeding the mixed gas has introduced a new radial temperature influence factor
[0007] The d...

Method used

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  • Preparation device and preparation method of cyanohydrin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A kind of preparation device of embodiment 1 cyanohydrin

[0057] It mainly includes shell 1, upper head 2, lower head 3, liquid distributor 4, baffle 5, reaction tube 6, feeding device 7, packing 8, liquid level gauge 9;

[0058] The two ends of the housing 1 are respectively connected to the upper head 2 and the lower head 3, the housing 1 is provided with reaction tubes 6, the number of which is used for the reaction, the housing 1 is provided with a baffle, and the reaction The tube 6 is filled with filler 8; the liquid distributor 4 is located at the upper head 2 close to the shell 1; the baffle 5 is arranged inside the lower head 3.

[0059] The liquid distributor 4 includes a distribution hole 15; the hole flow coefficient K value of the distribution hole 15 is 0.95;

[0060] The distance between the distribution hole interface of the liquid distributor 4 and the uppermost end of the housing 1 is h, and h is 250 mm.

[0061] Described feeding device 7 comprises...

Embodiment 2

[0070] Embodiment 2 A kind of preparation device of cyanohydrin

[0071] It mainly includes shell 1, upper head 2, lower head 3, liquid distributor 4, baffle 5, reaction tube 6, feeding device 7, packing 8, liquid level gauge 9;

[0072] The two ends of the housing 1 are respectively connected to the upper head 2 and the lower head 3, the housing 1 is provided with reaction tubes 6, the number of which is used for the reaction, the housing 1 is provided with a baffle, and the reaction The tube 6 is filled with filler 8; the liquid distributor 4 is located at the upper head 2 close to the shell 1; the baffle 5 is arranged inside the lower head 3.

[0073] The liquid distributor 4 includes a distribution hole 15; the hole flow coefficient K value of the distribution hole 15 is 0.8;

[0074] The distance between the distribution hole interface of the liquid distributor 4 and the uppermost end of the housing 1 is h, and h is 500mm.

[0075] Described feeding device 7 comprises h...

Embodiment 3

[0085] Embodiment 3 A kind of preparation method of cyanohydrin

[0086] Include the following steps:

[0087] (1) Feed

[0088] 3-Methylthiopropanal is fed by the first Venturi nozzle 11, and the feed rate is 1040kg / h, and the nozzle discharge speed is at 20m / s;

[0089] Hydrocyanic acid is fed by hydrocyanic acid feed inlet 10, and feed rate is 270kg / h, enters the second Venturi nozzle 12 together with 3-methylthiopropanal, and the discharge speed of the second Venturi nozzle 12 is 30m / s;

[0090] Adopt 1% ​​aqueous ammonia solution to be catalyzer, enter pipeline by catalyst inlet 13, feed rate is 15.4kg / h; Enter static mixer 14 and mix with 3-methylthiopropionaldehyde and prussic acid, mixing time is 1s.

[0091] (2) into the reactor

[0092] The mixed material is discharged into the liquid distributor 4 by the static mixer 14, and the residence time in the pipeline is 5s; the pipeline is the pipeline between the outlet section of the static mixer and the outlet secti...

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Abstract

The invention provides a preparation device and a preparation method of cyanohydrin. The device comprises a feeder, a shell, an upper sealing head, a lower sealing head, reaction tubes and a liquid level meter, two ends of the shell are respectively connected with the upper sealing head and the lower sealing head, the feeder comprises a hydrocyanic acid feeding inlet, a first Venturi nozzle, a second Venturi nozzle, a catalyst feeding inlet and a static mixer; and a back plate is arranged in the shell, the reaction tube is filled with a filler, a position, close to the shell, of the upper sealing head is provided with a liquid distributor, and the lower sealing head is provided with a baffle plate. The preparation method comprises the following steps: material feeding, feeding of materials into the reactor, and material discharging, wherein the material feeding step is characterized in that a raw material 3-methylthiopropoanaldehyde is sent into a pipeline through the first Venturi nozzle, a raw material hydrocyanic acid is sent into the pipeline from the hydrocyanic acid feeding inlet, the raw materials enter the liquid distributor, go through the distribution holes of the liquid distributor and are sent into the corresponding reaction tubes, the reaction tubes are filled with the filler, and the obtained material is discharged after a reaction. The reaction yield is 99.99-99.998%.

Description

technical field [0001] The invention relates to the technical field of liquid-liquid phase reaction, and more specifically relates to a cyanohydrin preparation device and a preparation method thereof. Background technique [0002] 2-Hydroxy-4-methylthiobutyronitrile (cyanohydrin for short) is an important intermediate for the preparation of D,L-methionine or liquid methionine. At present, industrial production mainly uses gaseous or liquid hydrocyanic acid and 3-methylthiopropyl Aldehydes prepare cyanohydrins under the action of catalysts. For reaction efficiency and cost considerations, liquid hydrocyanic acid and 3-methylthiopropionaldehyde are generally used for liquid-liquid phase reaction. [0003] In industrial production, for liquid-liquid phase reactions, fixed bed, fluidized bed, tower reactor, trickle bed, slurry bed, pipe reactor and various traditional reactors are usually used for reaction. These reaction devices are used For the reaction, there will be incons...

Claims

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Application Information

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IPC IPC(8): B01J8/06C07C319/20C07C323/60
CPCB01J8/06C07C319/20C07C323/60
Inventor 王志轩陈聪张立富石贤春
Owner SHANDONG XINHECHENG AMINO ACID
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