Production method of environment-friendly chlorinated paraffin-70

Abstract

The invention provides a production technology of environment-friendly chlorinated paraffin-70. The production technology is characterized in that a chlorinated paraffin-42 spray absorption tower is additionally arranged in the chlorination reaction process for conducting absorption purification treatment on photochlorination reaction tail gas. According to the technical scheme, in the production process, process control is reliable, the quality of a chlorinated paraffin-70 product is high, the safety coefficient of the production process is high, the recovery rate of carbon tetrachloride solvent is high, and the influence of carbon tetrachloride to ecology and atmospheric environment is small.

Description

technical field [0001] The invention relates to a production method of chlorinated paraffin. In particular, it relates to an environment-friendly chlorinated paraffin-70 production process. technical background [0002] Chlorinated paraffin-70, also known as high-chlorinated paraffin, chlorinated paraffin-70, 70-type chlorinated paraffin, referred to as CP-70, molecular formula C20H24C118~C24H29Cl21, molecular weight 1060~1100. White or light yellow powder, odorless, relative density 1.66-1.70. Chlorine content 70%. The softening point is 95~120~C. The refractive index is 1.540~1.580. It has good chemical stability and does not react with water, oxidants and dilute lye at room temperature. It has poor light and thermal stability. When the temperature exceeds 150°C, the stability begins to decrease gradually. Soluble in acetone, methyl ethyl ketone, dichloroethane, toluene, insoluble in methanol, ethanol, isopropanol, n-butanol, water. non-toxic. [0003] According to...

AI Technical Summary

Problems solved by technology

[0004] One is the "carbon tetrachloride solvent method", the process is relatively mature, it reacts at normal temperature and pressure, the speed is fast, and the technical indicators such as chlorine content and softening point are easy to meet the requirements, but the disadvantage is that it takes 3 to 4 times Carbon tetrachloride is used as a solvent, because carbon tetrachloride has a low boiling point, is volatile, is highly toxic to humans, and damages the environment, and the method is very complicated, the equipment investment is too high, the production cost is high, and the equipment is severely corroded. bad environment

[0005] One is the "water phase method", which has a fast reaction speed, but its investment is relatively high, and the product cost is higher than that of the "carbon tetrachloride method". The finished product still contains carbon tetrachloride, which has no effect on eradicating carbon tetrachloride In addition, because the hot dilute acid generated by water chlorination has a corrosive effect on chlorination and separation equipment, it is difficult to recover the dilute acid, and it is difficult to dry the semi-finished product after washing. With the increase of chlorine content in the reaction, water and materials are difficult to emulsify. Natural stratification is formed, and it is difficult to continue chlorination;

[0006] The third is the thermal chlorination method, which is a production method for producing RCL-70 by increasing the reaction temperature, providing activation energy and reducing the viscosity of the material. The speed is slow, the performance of the resulting product is also poor, and the application area is narrow