Process for preparing diethyl phosphite by-product triethyl phosphite

A technology of diethyl phosphite and triethyl phosphite, applied in the field of diethyl phosphite production, can solve the problems of low synthesis reaction temperature, a large number of anti-corrosion equipment, large environmental pollution, etc. The effect of low value cost and high yield
CN102827202BActive Publication Date: 2014-10-22荆州三才堂化工科技有限公司
3 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
荆州三才堂化工科技有限公司
Publication Date
2014-10-22

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
Patent Text Reader

Abstract

The invention relates to a technology for preparing diethyl phosphite by by-product of triethyl phosphite, belonging to the field of a preparation technology of diethyl phosphite. The method utilizes the by-product generated in the production of the triethyl phosphite to react with phosphorous acid, and the diethyl phosphite in the by-product of the triethyl phosphite can be recycled; the product is high in yield and good in purity, the equipment investment is less and the production cost is low; and the technology has the characteristics of being less in emission load of waste gas and waste water, environment-friendly and the like. According to the technology, the whole production process can be completed by one set of acid mixing kettle, one set of synthesis kettle and one set of rectifying tower, so that a production device is simple, the production capacity is high, the equipment investment is less, the operation is simple, and the production efficiency is high. The technology is low in consumption and high in yield. The distillate on the top of the tower and the high boiling point material discharged from the bottom of the tower can be recycled in the acid mixing kettle, so that air pollution and waste water are not generated in the whole production process, and the sewage treatment cost is very low. The technology solves the problems that the existing triethyl phosphite production technology is complicated, low in product yield, higher in energy consumption and higher in production cost.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a process for preparing diethyl phosphite by using triethyl phosphite by-product, and belongs to the technical field of diethyl phosphite preparation. Background technique

[0002] Now the domestic production of triethyl phosphite has reached 20,000 tons per year. As a by-product of triethyl phosphite, diethyl phosphite is mainly composed of 60-70% triethyl phosphite, % diethyl phosphite and 8-10% ethanol, because the boiling points of triethyl phosphite and diethyl phosphite are relatively close, their boiling points are 156.5°C and 187°C respectively, and it is difficult to separate them with a tower due to their similar boiling points , so the old process cannot recycle the triethyl phosphite and diethyl phosphite. According to statistics, about 500 tons / year of by-products of triethyl phosphite are waiting for biochemical treatment as waste, which brings certain harm to the surrounding environment. influences.

[0003] An...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More