Production method of chlorinated paraffin-70

    There are three main ways to produce chlorinated paraffin-70 in China. One is the "carbon tetrachloride solvent method". Its process is relatively mature. It reacts at room temperature, normal pressure and the speed is faster. The technical indicators such as chlorine content and softening point are most easily met. The disadvantage is that RCl-42 is used. , Three to four times carbon tetrachloride is used as a solvent. Because carbon tetrachloride has a low boiling point, is volatile, is highly toxic to humans, and is a substance that destroys the ozone layer, it is a prohibited product in the world, and this method is very complicated and equipment investment Too high, high production costs, severe equipment corrosion, and harsh operating environment for workers; one is the "aqueous phase method", which has a fast reaction speed. Starting from RCl-42, it can reach a chlorine content of 68 after only 5 hours of chlorination -72%, with a softening point of 100°C, but its investment is higher, the product cost is higher than the "carbon tetrachloride method", the finished product still contains carbon tetrachloride, and the use of carbon tetrachloride is not eradicated, in addition Because the hot dilute acid generated by chlorination with water has a corrosive effect on chlorination and separation equipment, the dilute acid is difficult to recover, the semi-finished product after water washing is difficult to dry, and as the chlorine content increases during the reaction, the water and materials are difficult to emulsify and form Natural stratification, continued chlorination is difficult to proceed; the other is the thermal chlorination method, which is to increase the reaction temperature, provide activation energy and reduce the viscosity of the material to produce RCl-70 production method, the quality of the products produced by this method generally exists The color is poor, the softening point is low, and the chlorine rate is slow. It is quite difficult to reach the specified chlorine content, and the thermal stability is poor. The resulting product has poor performance and a narrow surface.