Cleaner production has been disseminated worldwide quickly as a trend of environmental protection and realized as a turning point of environmental strategy from passive reaction to active action after it was raised in USA and some other developed countries at the end of 80′s. Pollution control system has many limitations, it consumes huge energy and resources, but still cannot solve the global environmental problems we are facing now. Cleaner production can solve the sustainable and harmonious problems of economic and environmental development as it focuses on source reduction. This paper introduces the origin and development of cleaner production systematically and discusses the importance of cleaner production strategy as compared with pollution control system.

The relation of organic synthesis and green chemistry is briefly described.The importance of atom economy in organic synthesisis emphasized.

Cleaner technologies for p roducing commodity organic chemicals are reviewed. These technologies are characterized either in obvious increase of the objective product selectivity to decrease pollutant discharge, or in making use of harmless or pollution free initial raw materials, catalysts and solvents. Trends of R&D in China Petrochemical Corporation are introduced in the paper.

A ccording to the redox mode, the selective oxidation of hydrocarbons using lattice oxygen as oxidant could be implemented in the following manner: a riser reactor for oxidation of hydrocarbon with lattice oxygen to form product, a regenerator for reoxidation of catalyst by air to restore its initial state. There are several advan tages in the separation of redox process comparing with cofeed mode: (1) A high selectivity of product could be obtained, because nonselective oxidation could be inhibited in the absence of gas phase oxygen; (2) A highly concentrated hydrocarbon feed stream could be used due to no trouble with explosion limit, that results in a simpler separation of the products and the recovery of unconverted hydrocarbon feed for recycle. This new technology is very useful for selective oxidation of hydrocarbons to save raw materials, improve environment and enhance economic benefit. In this paper, the current research and advances, the facing challenges, and the potential applications of the selective oxidation of hydrocarbons with lattice oxygen are briefly reviewed.

This paper describes the advances in the syntheses of water soluble phosphines and aqueous biphasic catalysis by water soluble phosphine transition metal complexes, especially in the hydroformylation of olefins and the hydrogenation of A, B2unsaturated carbonyl compounds, and also in the asymmetric catalytic synthesis. The problems to be overcome in the applications of aqueous biphasic catalysis are discussed.

Superior solid acid catalysts are needed for existing industrial processes and for environmental considerations, especially for those using conventional liquid acids, i. e.H₂SO₄, HF,AlCl₃ etc. as catalyst s in homogeneou s system s. Recen t ly, by con sidering the similarities between acid sites (cen ters) playing decisive role in both homogeneous and heterogeneous acid catalytic processes, based on the refined theory of homogeneous acid catalysis in liquid phase, and through the analysis of the nature of different kinds of acid sites(Lewis,Bronsted and super acids) , an unique model of acid structure for superior solid acid has been proposed, and thus the tailoring of several different forms of solid acid catalysts might be allowed.

This paper introduces the research contents and methods of green chemistry in chromic salts production. The new green chemistry principles of the newly developed heterogeneous reaction and separation system of molten salt liquid oxidization- one way separation in high concent ration medium - quasisteady phase separation- carbonizing circle conversion are first described, then the whole green industrial chemistry system of the deep use of resources- the inner circle of reaction medium-zero emission is introduced.

Main pollutant sources of paper industry are cooking black liquid and bleaching waste water. This paper discusses key technology and methods to solve environmentally pollutant problems, and it also introduces basic countermeasures suitable to environmental protection of paper industry in China.

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Great progress in environmentally friendly coatings with lowor zero-VOC emission has been made during last decade. The performances, applications and perspectives of vairous coatings including highsolids solventborne coatings, powder coatings,waterborne coatings and liquid solventless coatings are reviewed.

This review summarizes the polymer preparation that has been carried out in supercritical carbon dioxide. A number of polymerization reactions, such as the homogeneous free radical polymerization of flourinatedmonomers, the dispersion polymerization of methy methacrylate and styrene, the precipitation polymerization of acrylic acid, the inverse emulsion polymerization of acrylamide and the cationic polym erization of isobutyl vinyl ether, can be conducted in supercritical carbon dioxide. This indicates that a wide range of polymers can be prepared in this environmentally sound and inexpensive supercritical carbon dioxide.

The recent developments of foreign environm entally friendly petroleum refining technology related to reformulated gasoline, low sulfur and low aromatics diesel fuel, nontoxic and harmless catalysts, reduction of caustic wste and improvement of process selectivity are briefly reviewed. The research and development activities in these fields at home are also discussed.

The state of the arts in degradable plastics is reviewed. The research and development on degradable plastics should be focused on degradation time control,biodegradable plastics synthesis, improving processing technology, lowering production costs, controllable photo biodegradable plastics, application in disposal plastics ( e. g.mulches, packing materials and dinner sets). It is of first importance to define the terminology of degradable plastics and establish evaluation method on degradation.

Chlorofluoro carbons (CFCs) are one of the most important chemical materials in developing national economy. Because of their ozone depletion effect, it is imperative to control their uses and to find their alternatives. It is a very important subject in organic fluorine chemistry.