The most recent progress of olefin cross-metathesis reaction process,reactive mechanism,catalytic theory and catalysts for metathesis is reviewed in this paper and we try to explain the improved aspect of catalyst performance and provide reference for the study of metathesis catalyst afterwards.

By studying the process of producing ammonium chloride after the double decomposition of the waste residue ---sodium chloride and sulphuric acid, we can see that only under the condition of being given certain temperature, density, andproportion, ammonium chloride can be made after adding alkali, washing, absorption of active carbon, and crocking.

Study on the effect of salt on double decomposition reaction of brine and ammonium bicarbonate was investigated.

Study of the genetic conditions of the metathetical reaction;

The preparation method of potassium pentaborate (KB5O8) was studied with the replacement reaction between potassium chloride and sodium pentaborate solution.