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High purity hcn from acrylonitrile co-production

A common and simultaneous operation technology, applied in the preparation/purification/separation of hydrogen cyanide, preparation of ammonium salt, purification/separation of carboxylic acid nitrile, etc., can solve problems such as clogging of insoluble solids

Active Publication Date: 2021-06-15
INVISTA TEXTILES (U K) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under some conditions, the combined recovery / purification process can form insoluble solids that can accumulate and plug equipment

Method used

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  • High purity hcn from acrylonitrile co-production

Examples

Experimental program
Comparison scheme
Effect test

example

[0055] The following examples refer to the schematic flow chart as shown in the figure.

example 1

[0056] Example 1 (dotted line 9 shown schematically in the figure)

[0057] In a commercial ACRN production facility, the ammoxidation reactor system 101 catalytically converts C in the presence of ammonia (stream 2) and an oxygen source (stream 3). 3Hydrocarbons (stream 1), such as propylene, are converted to ACRN. The fluidized bed reactor produces a hot gaseous effluent rich in ACRN with by-products AN and HCN (stream 4). The gaseous effluent is quenched in countercurrent quench column system 301 using a quench liquid (stream 12). The quench liquid is acidic (low pH) so that excess ammonia is effectively washed out of the reactor effluent. An organic or inorganic acid such as sulfuric acid or phosphoric acid is used to remove the ammonia in the bottom of the quench column (stream 15) as a soluble ammonium salt. The quenched product gas (stream 14) is then passed to a countercurrent absorber system 401 where the absorbent liquid (stream 16) extracts the reactor product (s...

example 2

[0059] Example 2 (solid lines 8 and 10 shown schematically in the figure)

[0060] Crude HCN product stream 9 of Example 1 is sent to quench column 301 of Example 1 via streams 8 and 10 along with ammoxidation reactor gaseous stream 4 . The flow rate and acidity of the quench liquid (stream 12) is adjusted for the combined ammonia entering the quench column via streams 4 and 10. Quench column 301 is effective to scrub any excess ammonia from the incoming feed. The scrubbed quench gas (stream 14) is fed to the absorption column 401 of Example 1. The absorbent liquid flow rate (stream 16) is adjusted for the combined nitrile present in the quench gas (stream 14). Absorption column 401 enriches in bottoms stream 17 all nitrile products, ie, ACRN, AN and HCN. No ammonium salt formation was observed, resulting in no solid plugging at the base of the absorber.

[0061] Absorber bottoms crude product stream 17 is processed in a downstream nitrile recovery and purification zone (n...

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PUM

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Abstract

A process for the co-production of ACRN and HCN with improved HCN selectivity and reduced solids formation in a common product recovery zone is disclosed.

Description

technical field [0001] The present invention relates to the joint production method of acrylonitrile and hydrogen cyanide. Background technique [0002] Acrylonitrile (ACRN) is an important monomer for the synthesis of various polymers including acrylic fibers, synthetic rubber, nylon, and is a starting material for acrylic acid and acrylamide. Processes for the preparation of ACRN include the Sohio process in which propylene is reacted with ammonia and oxygen (air) over a catalyst at elevated temperature ("ammoxidation"). Hydrogen cyanide (HCN) and acetonitrile (AN) are formed as by-products. [0003] HCN is a valuable by-product and is used, for example, as a starting material for the synthesis of various polymers, including polyamides, and chemicals. [0004] Injection of methanol into the ACRN reactor in the Sohio process increased HCN production, reducing the ACRN:HCN weight ratio in the crude effluent from 10:1 to 8:1. [0005] US Patent No. 8,585,870 discloses a me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C3/02C07C253/34C07C255/08
CPCC01C1/245C01C1/28C01C3/0212C01C3/0229C01C3/0295C07C253/34C07C255/08
Inventor 本杰明·D·赫佐格米林德·V·坎塔克
Owner INVISTA TEXTILES (U K) LTD