Shi Yongjun

TL;DR: In this paper, a method for refining caprolactam by organic solvent crystallization was proposed, and the method was concretely characterized in that solvent crystallisation and recrystallization are used; a impurity-containing caustic water solution is subjected to benzene extraction to obtain a caprolactic solution; the caustics solution was subjected to evaporative crystallization and recrasing to obtain high-quality caustically used benzene; benzene is refined to be cyclically used.

TL;DR: In this paper, a method for refining and purifying caprolactam was proposed, which has the advantages of low energy consumption, small effluent discharge, lowered production cost and improved safety.

TL;DR: In this paper, a method for preparing sodium carbonate from sodium sulfate was proposed, which is based on the original ammonia-soda process for preparation, clarifying to remove impurities in an ammonia distillation mother liquor, stirring the mother liquor at a temperature of 30-65 DEG C according to calcium chloride content, adding sodium sulfates into the ammonia distilled mother liquor according to a mole ratio of calcium chloride to sodium sulphate of 1: 1-1.1, carrying out a reaction process to obtain sodium chloride and gypsum (CaSO4.

TL;DR: In this paper, a method for removing aerosol smog in ammonia desulphurization of flue gas was proposed, which comprises the following steps of: pumping pulp at the bottom part in a desulfurizing tower into a pulp cooling device through a pump or excess pressure, performing heat exchange cooling on the pulp to reduce the temperature of pulp to 10-32 DEG C, and then, and pumping the pulp into a spray head at the top of the desulfuring tower through a lifting pump to spray the pulp, wherein the low temperature pulp touches the

TL;DR: In this article, a direct heat exchange based cooling crystallization method is proposed, which comprises steps as follows: an organic medium which is insoluble with a solute solution and has a freezing point lower than 5 DEG C and a boiling point higher than 30 DEGC is adopted as a heat transfer medium; the organic medium is cooled to be 1-4 DEG c lower than an aqueous inorganic salt solution, low-temperature organic medium countercurrent and a solution are contacted in a crystallizer for heat exchange, the low-time temperature organic medium