Salifying reactor and method for preparing isocyanate

A reactor and salt-forming technology, which is applied in the field of salt-forming reactor and the preparation of isocyanate by using the reactor, to achieve the effects of low hydrolysis chlorine, avoiding incomplete amine reaction, and low color number

Active Publication Date: 2021-07-30
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of this reactor to prepare isocyanate monomers by salt-forming phosgenation can effectively solve the problems of agglomeration of hydrochloride slurry and uneven dispersion of hydrochloride particles in inert solvents, making hydrochloride slurry The microscopic distribution of the material is more uniform, and the hydrochloride slurry with high conversion rate and uniform particle size distribution is obtained, which reduces the generation of chlorinated by-products in the photochemical process, and finally improves the yield and quality of the product isocyanate

Method used

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  • Salifying reactor and method for preparing isocyanate
  • Salifying reactor and method for preparing isocyanate
  • Salifying reactor and method for preparing isocyanate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] like figure 1 As shown, a salt reactor volume is 600L, and the cylindrical porous plate 14 is 1 / 3 of the kettle body 1 diameter, the opening rate is 50%, the aperture 30 μm; the height and disc distribution of the cylindrical porous plate 14 The ratio of the top distance of the kettle body 1 is 1: 4; the disk distributor 8 opens the opening rate of 60%, the aperture 20 μm; the hollow grinding block (60% openings rate) is a hollow cone shape, a height of 3 cm, and a hollow grinding The block settings are 40% of the inner surface area, the outer surface area, and the disk distributor 8, respectively; 2 / 3 of the diameter of the rotary polishing cartridge 9 is 2 / 3 of the kettle body 1; the angle of the scraper 19 is 40 °. The number of scrapers on the rotating grinding cylinder 9 is 8.

[0066]In the kettle body 1, 160 kg of chlorobenzene was added to the solvent feed tube 20 as a reaction solvent, and the stirring 700 rmp was opened, and the hydrogen chloride compressed gas wa...

Embodiment 2

[0069] like figure 1 As shown, the salt reactor volume is 600L, and the cylindrical porous plate 14 is 1 / 2 of the diameter of the kettle body 1, the opening rate is 60%, the aperture 20 μm; the height and disc distribution of the cylindrical porous plate 14 The ratio of the top distance of the kettle body 1 is 1: 5; the disk distributor 8 opens up 70%, the aperture 10 μm; the hollow grinding block (50% openings rate) is a hollow cone shape, a height 5cm, a hollow grinding The block settings are 60% of the inner surface area, the outer surface area, and the disk distributor 8, respectively; the diameter of the rotating polishing cylinder 9 is 3 / 4 of the kettle body 1; the angle of the doctor blade 19 is 50 ° The number of scrapers on the rotating grinding cylinder 9 is 10.

[0070] In the kettle body 1, 120 kg of chlorobenzene is added to the solvent feed tube 20 as a reaction solvent, and the stirring 700 rmp is opened, and the hydrogen chloride compressed gas is passed through th...

Embodiment 3

[0073] like figure 1 As shown, the salt reactor volume is 600L, and the cylindrical porous plate 14 is diameter of 1 / 2, the opening rate of 70%, the hole diameter is 10 μm; the height of the cylindrical porous plate 14 is distributed. The ratio of the top distance from the column of kettle body 1 is 1: 5; the disk distributor 8 opens the opening rate of 70%, the aperture 5 μm; the hollow-grinding block (70% openings ratio) is a hollow cone shape, a height 6cm, and the hollow grinding The block settings are 70% of the inner surface area, the outer surface area, and the disk distributor 8, respectively; the diameter of the rotating polishing cartridge 9 is 3 / 4 of the kettle body 1; the angle of the doctor blade 19 is 60 ° The number of scrapers on the rotating grinding cup 9 is 12.

[0074] In the kettle body 1, 180 kg of chlorobenzene was added to the solvent feed tube 20 as a reaction solvent, and the stirred 800 rmp was opened, and the hydrogen chloride compressed gas was passed ...

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Abstract

The invention discloses a salifying reactor and a method for preparing isocyanate by adopting the same. The reactor comprises a kettle body, a crude salt system, a refined salt system, a disc distributor, a fluid director and a mechanical stirrer; the crude salt system comprises a gas-phase feeding distributor, a liquid-phase feeding distributor and a cylindrical perforated plate, wherein the liquid-phase feeding distributor and the gas-phase feeding distributor are respectively communicated with a gas-phase feeding pipe and a liquid-phase feeding pipe; and the refined salt system comprises a rotary grinding cylinder and a grinding sheet. Through the reactor, the conversion rate of amino salifying can be improved while the salifying efficiency is improved; and the yield and the product quality of isocyanate are effectively improved by reducing the particle size of hydrochloride particles.

Description

Technical field [0001] The present invention relates to a formation of a salt reactor and a method of preparing an isocyanate using the reactor, and in particular, a method of synthesizing isocyanate is formed into a salt-fluidized reaction. Background technique [0002] Isocyanate is the main raw material of polyurethane, polyurethane material is currently the best thermal insulation material in international performance, has good oil-resistance, toughness, wear resistance, aging resistance and adhesion, a large amount of polyurethane material, therefore A large amount of isocyanate is required. In an existing isocyanate synthesis reaction, a carballation of the isocyanate is prepared by reacting an alternating solvent in an inert solvent in an existing isocyanate synthesis reaction. For existing methods, chlorobenzene or o-chlorobenzene is usually used as a solvent, which is widely used because of its good inert and dissolved power, and is very suitable for recovering excess of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/18C07C263/10C07C265/14
CPCB01J19/18C07C263/10C07C265/14Y02P20/10
Inventor 吕振高韩金平孙淑常尚永华王京旭史培猛吴谦寇梦存孙立冬石滨
Owner WANHUA CHEM GRP CO LTD
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