Technique and device for continuously refining heavy liquid paraffin

Abstract

The invention belongs to the technical field of refinement of heavy liquid paraffin, and particularly discloses a technique and device for continuously refining heavy liquid paraffin. The main technical scheme is as follows: liquid paraffin, hydrogen chloride gas and softened water simultaneously and continuously enter a first-stage reaction tower, of which the height is 10 meters or so, to react; the softened water absorbs hydrogen chloride to be converted into hydrochloric acid; the hydrochloric acid is further subjected to chemical reaction with aromatic hydrocarbons, basic nitrogen and iron ions in the liquid paraffin to generate benzyl chloride, toluene dichloride, benzotrichloride, benzotrichloride, iron chloride, pyridinium, quinoline salt and the like with the specific gravity of greater than 1 g / ml, which are dissolved or mixed in the hydrochloric acid with the specific gravity of 1.16 g / ml; and thus, the substances with the specific gravity of greater than 1 g / ml can be separated from the clean liquid paraffin with the specific gravity of 0.8 g / ml. The device and method disclosed by the invention can be used for completely separating the impurities from the liquid paraffin, and more importantly, the closed circulating device has the characteristic of environmental protection.

Description

Technical field [0001] The present invention belongs to the technical field of heavy liquid paraffin refining technology, and specifically relates to a process and device for continuous refining heavy liquid paraffin used for producing chlorinated paraffin-52. Background technique [0002] Chlorinated paraffin-52 is an important industrial raw material, widely used in polyvinyl chloride, polyurethane, rubber and plastics, oil and other industries. The heavy liquid paraffin is the basic raw material for the production of chlorinated paraffin-52, which contains 3-10ppm of aromatic hydrocarbons, basic nitrogen, iron ions and a few thousandths of moisture impurities. These impurities will form colored bases after chlorination. Group, which has a great impact on the quality of the subsequent production of chlorinated paraffin-52, and has long puzzled the production of chlorinated paraffin-52; therefore, the aromatics, basic nitrogen, and iron ions are processed before heavy liquid par...

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Problems solved by technology

[0003] The physical static precipitation and adsorption method is to leave the liquid paraffin for three days, remove the moisture, and then process it through activated carbon and silica gel; the liquid paraffin processed by this method can obviously reduce the iron ion and moisture in the liquid paraffin, but the liquid paraffin The content of aromatic hydrocarbons and basic nitrogen in the wax does not change much, which cannot fundamentally solve the problem, and it is difficult to separate the water in the liquid paraffin that is only one thousandth to one ten thousandth of the content;

[0004] The hydrochloric acid continuous washing treatment method is a chemical treatment method in which hydrochloric acid produced by the side reaction of chlorinated paraffin is passed into liquid paraffin, so that aromatic hydrocarbons, basic nitrogen, and iron ions are mixed in hydrochloric acid in the form of chloride. This method makes chlorinated paraffin The whiteness has been greatly improved, but because the hydrochloric acid produced by the side reaction of chlorinated paraffin is continuously fed into the liquid paraffin, the separation of hydrochloric acid and liquid paraffin is not complete, and a small amount of water is brought into the liquid paraffin, which will cause the loss of chlorinated paraffin-52. decreased transparency;

[0005] The chemical hydrogen chloride treatment method is to use the hydrogen chloride gas generated by the reaction of chlorinated paraffin to pass through the chemical treatment method of liquid paraffin, so that aromatic hydrocarbons, basic nitrogen, and iron ions settle in the lower layer of liquid paraffin in the form of chloride, and then separate after precipitation; This method greatly improves the quality of liquid paraffin, which can meet the quality requirements of chlorinated paraffin-52, but in practical applications, it is difficult to precipitate and separate the reactants of this method, and the separated impurities contain more than 90% of liquid

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