Method for purification of coarse sulfur

Abstract

The invention relates to a method for purifying crude sulfur, in particular to a method for purifying the byproduct crude sulfur of coke-oven gas of coke plant by a vacuum distillation method, belonging to the technical field of coal chemical. By adopting the vacuum distillation method, the vacuum distillation is carried out in an external heating typed vacuum furnace under the conditions of 5-400Pa of system pressure, 50-100 DEG C of distillation temperature and 15-120 minutes of distillation time, thus gaining the sulfur with the purity reaching national class-A. Furthermore, according to raw material composition and the requirement of product purity, one-step distillation or two-step distillation or multi-step distillation can be selected to purify the raw material and gain the sulfur product of needed quality. The method has the advantages of simple process flow, low sulfur purification cost, small environmental pollution, good industrial prospect, and the like.

Description

[0001] One, technical field: the present invention relates to a kind of method for crude sulfur purification, particularly relate to the method for purifying coke oven gas by-product crude sulfur with the method for vacuum distillation. It belongs to the technical field of coal chemical industry. 1. Background technology: [0002] Sulfur is an important chemical raw material. The fertilizer industry is the largest user of sulfur. At present, more than 80% of the world's sulfur production is used for sulfuric acid production, followed by various special sulfur and special sulfur. The uses of sulfur also include explosives, steel pickling, medicine and food industry, safety stripping, water treatment, electrolysis industry, catalysts, pigments, chemicals, alcohols, adhesives, pesticides, etc. [0003] The world is rich in sulfur resources, and there are two main sources of sulfur: one is the sulfur extracted from natural sulfur mines; the other is the sulfur recovered from petro...

AI Technical Summary

Problems solved by technology

[0007] Zhu Yuting et al. used organic solvent extraction to purify crude sulfur to obtain relatively pure sulfur, but from the introduction to the process, it can be learned that the above process has subordinate shortcomings: the organic solvent used is relatively toxic and volatile, and All belong to flammable and explosive substances; the process is more cumbersome, and it needs to be dissolved and filtered repeatedly. For the above-mentioned highly volatile toxic organic solvents, the recovery rate is low, and it will lead to deterioration of the working environment, and even lead to Workers poisoned; since the final pure sulfur is from CS 2 、C 2 HCl 3 , CCl 4 Cool and crystallize in a saturated solution and suck it out. Therefore, theoretically, the yield of sulfur will not be too high, because more sulfur still remains in the above-mentioned organic solvent.