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Process for the purification of hydrogen cyanide

A hydrogen cyanide and logistics technology, applied in the preparation/purification/separation of hydrogen cyanide, chemical instruments and methods, cyanide, etc., can solve the problems of no inhibition and reduction of accumulation

Pending Publication Date: 2021-03-16
EVONIK OPERATIONS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, experimental data from WO 2017 / 011428 A1 show that this method does not inhibit or at least significantly reduce the accumulation of nitriles in the separation vessel

Method used

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  • Process for the purification of hydrogen cyanide
  • Process for the purification of hydrogen cyanide
  • Process for the purification of hydrogen cyanide

Examples

Experimental program
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Effect test

Embodiment 1

[0078] Purification of a hydrogen cyanide stream comprising hydrogen cyanide according to the invention

[0079] Using the modeling software Aspen against figure 2 The distillation process shown simulates the purification of a hydrogen cyanide-containing stream: the aqueous feed stream (1) from the HCN absorber containing 4-5% by weight hydrogen cyanide is divided into a first liquid stream (2) and a second liquid stream (2). Two liquid streams (3). Stream (2) is heated in heat exchanger (7) to a temperature of 92°C by heat exchange with bottom stream (6) from distillation column (4) to obtain heated stream (8). Said stream (8) is introduced between the 7th and 10th tray of a distillation column (4) having 20 trays. The cooled bottom stream ( 11 ) thus obtained, which mainly comprises water, is recycled to the HCN absorption column. Stream (3) is introduced at the top of distillation column (4) at a temperature of 24.9°C. An overhead vapor stream (5) rich in hydrogen cy...

Embodiment 2

[0087] Comparison with prior art steps

[0088] In this example, the Figure 5 The results shown for the purification of a stream comprising hydrogen cyanide in a prior art distillation process (experimental data) are compared with those of a stream comprising hydrogen cyanide in a process according to the invention (using Aspen The simulated data for figure 2 methods shown) were compared. In order to compare the operating parameters of the two processes, the prior art process was carried out at the distillation overhead at a temperature of 47.3° C. to obtain an overhead vapor stream (5) of the same composition and quality. The same applies to the method according to the invention. In the prior art distillation process, the temperature at the top of the distillation column is regulated by a reflux ratio of 0.26. In the process according to the invention, the temperature at the top of the distillation column (4) is adjusted by adjusting the proportion of the second liquid...

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Abstract

The present invention relates to a process for the purification of hydrogen cyanide, comprising the steps of a) splitting a liquid feed stream (1) comprising hydrogen cyanide into at least a first liquid stream (2) and a second liquid stream (3), b) introducing the first liquid stream (2) into a distillation column (4) at a point between the top and the bottom of the distillation column,c) introducing the second liquid stream (3) into the distillation column (4) at the top of the distillation column, d) withdrawing an overhead vapor stream (5) enriched in hydrogen cyanide from the distillationcolumn (4), and e), withdrawing a bottom stream (6) depleted in hydrogen cyanide, wherein the temperature of the second liquid stream (3) in step c) is lower than the temperature of the first liquidstream (2) in step b).

Description

technical field [0001] The present invention relates to a method for purifying hydrogen cyanide. Furthermore, the present invention also relates to a process for preparing 2-hydroxy-4-(methylthio)butyronitrile by reacting hydrogen cyanide obtained by the purification process according to the present invention with 3-mercaptopropionaldehyde. Background technique [0002] Hydrogen cyanide (HCN) can be prepared by the so-called Andrussow process or the so-called BMA process or Degussa process. The Andrussow method produces hydrogen cyanide in the gas phase reaction from methane, ammonia and oxygen in the presence of a platinum catalyst: [0003] CH 4 +NH 3 +1.5O 2 →HCN+3H 2 O,ΔH R =-481.06kJ / mol [0004] Ammonia, natural gas (methane) and oxygen are fed into the reactor and reacted at a temperature in the range of 800-1500°C in the presence of a platinum catalyst. Usually, methane is supplied by natural gas, which can be further purified; C 2 、C 3 and higher hydrocarb...

Claims

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Application Information

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IPC IPC(8): C01C3/02
CPCC01C3/0295C07C323/23C07C319/26C07C319/22B01D3/007B01D3/008C07C319/20C07C319/28
Inventor M·克费尔M·艾克C·D·贝克尔T·默克M·布斯曼
Owner EVONIK OPERATIONS GMBH
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