Trimethyl phosphite continuous reduced-pressure rectifying technology

A technology of trimethyl phosphite and vacuum distillation, which is applied in chemical instruments and methods, organic chemistry, compounds of Group 5/15 elements of the periodic table, etc., can solve the problem of insufficient yield and high purity, and reduce tail gas Emissions, improved stability, high exhaust gas recovery effects

Inactive Publication Date: 2018-03-27
NANTONG JIANGSHAN AGROCHEM & CHEM LIMITED LIABILITY
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  • Abstract
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Problems solved by technology

The invention is used to prepare trimethyl phosphite, the distillation process is relatively simple, and the purity of the yield is not high enough

Method used

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  • Trimethyl phosphite continuous reduced-pressure rectifying technology

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Embodiment Construction

[0026] Such as figure 1 In the continuous vacuum distillation process of trimethyl phosphite shown, the top of the distillation tower is equipped with a first-stage water-cooled condenser and a second-stage brine condenser at about -8°C, and the temperature of the gas phase at the top of the tower is controlled < 0 ℃;

[0027] The gas phase after the two-stage condensation is firstly demistered by the demister, and finally enters the dry screw vacuum pump. The interior of the rectification tower of the control tower is under negative pressure, and its vacuum degree is -88~-90 kPa;

[0028] The condensate pumped by the demister and the vacuum pump flows into the washing tank through the pipeline;

[0029] The liquid condensed by the primary condenser and the secondary condenser enters the rectification reflux tank;

[0030] The condensate flowing into the water washing tank is returned to the rectification tower, and then participates in the distillation process, and so on. ...

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Abstract

The invention discloses a trimethyl phosphite continuous reduced-pressure rectifying technology. A first-level water cooling condenser and a second-level salt water condenser are arranged at the top of a rectifying tower; a gas phase temperature at the top of a control tower is lower than 0 DEG C; after two levels of condensation, the gas phase is demisted by a demister and finally enters a vacuumpump; pressures in the control tower and the rectifying tower are negative pressures. After being condensed by the first-level condenser and the second-level condenser, liquid enters a rectifying reflux tank; the liquid after third-level condensation enters a receiving tank. The technology disclosed by the invention remarkably reduces loss of trimethyl phosphite, has high yield, lowers abrasion of the vacuum pump and realizes high recovery rate of tail gas.

Description

technical field [0001] The invention relates to a production process of trimethyl phosphite. Background technique [0002] Trimethyl phosphite is an important chemical intermediate, which can be used to prepare a series of vinyl phosphate insecticides such as dichlorvos and ammonium phosphate; in addition, it can also be used to manufacture flame retardant products such as DMMP. [0003] In production, to prepare refined trimethyl phosphite with a content ≥99.5%, vacuum distillation is required. The vacuum distillation of trimethyl phosphite usually uses the jet vacuum process, which is simple to use and has a good vacuum degree; however, the jet vacuum equipment occupies a large area and consumes a lot of energy; a small amount of triphosphite dissolved in the jet circulating water Methyl ester, causing on-site odor, requires frequent water changes, and produces a large amount of wastewater; in summary, the jet vacuum process is neither energy-saving and environmentally fr...

Claims

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Application Information

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IPC IPC(8): C07F9/142
CPCC07F9/142
Inventor 吉伟孟长春沈康徐勇陆沈华蒋俊张维高黄波
Owner NANTONG JIANGSHAN AGROCHEM & CHEM LIMITED LIABILITY
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