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.

Ruthium-Catalyzed Olefin Metathesis Reactions and Organocatalytic Alkylations;

The special mechanism and reaction type of olefin metathesis is reviewed with focuses on ring-closing metathesis,ring-opening metathesis and cross metathesis in organic synthesis.

The Nobel Prize for Chemistry for 2005 is shared by three chemists, YvesChauvin, Robert H Grubbs and Richard R Schrock, who have made fundamental discoveriesin olefin metathesis and its application in organic synthesis and polymerization.

Complex decomposition reactive crystallization process is widely used to produce potassium fertilizer without chloride economically and efficiently.

The base principle,key technology,characteristic and progress on synthesis of ceramic powders by solid-state metathesis reactions are described.