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Catalyst for phosgene synthesis, and preparation method and application thereof

A technology for catalyst and phosgene, which is applied in the field of catalyst for preparing phosgene and its preparation, can solve the problems of poor thermal conductivity, low quality of phosgene and by-product steam, and high maintenance cost

Active Publication Date: 2019-11-15
万华化学(福建)有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In summary, the existing process for preparing phosgene by catalytic reaction of carbon monoxide and chlorine mainly has the following problems: the existing activated carbon catalyst has poor thermal conductivity, severe pulverization, and low activity, resulting in short service life and reactor diameter. The temperature difference between the direction and the axis is large, the quality of phosgene and by-product steam is low, it cannot run stably for a long time, the maintenance cost is high, and the safety is poor.

Method used

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  • Catalyst for phosgene synthesis, and preparation method and application thereof
  • Catalyst for phosgene synthesis, and preparation method and application thereof
  • Catalyst for phosgene synthesis, and preparation method and application thereof

Examples

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preparation example Construction

[0099] Table 1. Preparation conditions and physical property data of different activated carbons

[0100]

[0101] Other main sources of raw materials used in the embodiments of the present invention or comparative examples:

[0102] Bismuth nitrate was purchased from Shenyang Xinguang Chemical Factory;

[0103] Polyvinyl alcohol and pentylene glycol were purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.;

[0104] Hydrochloric acid and nitric acid were purchased from Xilong Chemical Co., Ltd.;

[0105] Unless otherwise specified, other raw materials are also commercially available raw materials.

Embodiment 1

[0107] Catalyst 1# prepared for phosgene synthesis,

[0108] (1) Weigh 100g AC-2 activated carbon, 5g carbon nanotubes, disperse in 500mL concentration of 0.4mol / L bismuth nitrate nitric acid solution (wherein 68% nitric acid consumption is 40.1g), heat, stir and reflux at 85°C for 5h ;

[0109] Suction filter the above slurry, wash with deionized water until the filtrate is neutral, collect the upper filter cake, and dry at 120°C for 2 hours to obtain a mixed powder of activated carbon and carbon nanotubes;

[0110] (2) In the mixed powder of above-mentioned active carbon and carbon nanotube of 105g, add the polyvinyl alcohol aqueous solution of 10.4g concentration 10wt% molecular weight successively and be the polyvinyl alcohol aqueous solution of 50000, 2.08g concentration 2.5wt%, pH is the hydrochloric acid solution of glutaraldehyde of 1.23 , knead into a plastic embryo body, and extrude to obtain a strip with a diameter of 3 mm and a length of 3 to 6 mm;

[0111] The a...

Embodiment 2

[0116] Catalyst 2# was prepared with reference to Example 1, with the difference that AC-3 activated carbon was used as a raw material, and the obtained strip was calcined at 750° C. for 5 h in an argon atmosphere to obtain a catalyst.

[0117] In catalyst 2#, the mass ratio of carbon nanotubes to activated carbon is 0.05:1, and the catalyst also contains about 0.6wt% polyvinyl alcohol and residual carbon after high-temperature roasting of glutaraldehyde. The thermal conductivity test was carried out on catalyst 2#, and its thermal conductivity at room temperature was found to be 3.04W·m -1 ·K -1 .

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Abstract

The invention relates to a catalyst for phosgene synthesis, and a preparation method and an application thereof. The active components of the catalyst include activated carbon and carbon nanotubes, the intensity ratio of the graphitization degree of the activated carbon in the D band to the G band in Raman spectroscopy is 0.6-1.0, and the specific surface area is greater than 800 m<2> / g; and the thermal conduction coefficient of the catalyst is greater than 1 W.m<-1>.K<-1>. The preparation method of the catalyst is simple. The activated carbon and carbon nanotubes are treated by using a nitricacid solution of bismuth nitrate to obtain carbon nanotubes and activated carbon which are connected by chemical bonds, and the catalyst has the advantages of high activity, high thermal conductivityand long service life. advantage. A phosgene synthesis method adopting the catalyst of the present invention makes the temperature distribution of a reactor bed uniform, so heat release in the phosgene synthesis reaction can be easily used to obtain high-quality phosgene, and the also method can effectively extend the safe and stable running cycle of a device and reduce the running and maintaining cost.

Description

technical field [0001] The invention relates to the technical field of preparing phosgene by reacting carbon monoxide and chlorine, in particular to a catalyst for preparing phosgene and its preparation method and application. Background technique [0002] Phosgene, also known as phosgene or phosgene, is an important organic intermediate widely used in organic compounds, monomers and polymers, such as isocyanates, urea derivatives, carbamoyl chlorides, carbonates , benzophenone, polyurethane and polycarbonate, etc. High-quality phosgene is mostly used in high-end products. For example, the preparation of polycarbonate plastics needs to contain at most 50ppm free chlorine, otherwise it will affect the washing effect and cause serious corrosion of equipment; and at most 50ppm carbon tetrachloride impurities, otherwise it will make The color tone of the polycarbonate resin deteriorates and the corrosion resistance of the mold decreases. [0003] It is known that carbon monoxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18C01B32/80
CPCB01J23/18C01B32/80
Inventor 易光铨孙康邵亮锋王磊黎源华卫琦
Owner 万华化学(福建)有限公司
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