Rise in price to answer the raw material such as benzene anhydride, suitable anhydride in recent years, colophony of not saturated polyester (UPR) industry puts forward “ and raw material to rise in price the slogan that becomes fight ” , deliver the view to ethylene the double-loop the fifth of the ten Heavenly Stem in deputy resource yield C5 2 Xi (DCPD) . Home uses the history of DCPD preparation UPR, but the initial stage of industrialization of UPR of restrospect to our country. 20 centuries 60 time metaphase, tianjin synthesizes academy of chemical industry of material institute, Beijing, with Tianjin city synthetic material factory was begun, the research that uses DCPD preparation UPR works, 60 time evening adds up to timber plant to realize industrialization in Tianjin. DCPD is used at the large-scale industrialization of UPR, only then at 20 centuries 80 time, at that time Jiangsu Changzhou inferior state chemistry limited company, used DCPD in great quantities in the production of UPR, reduced colophony to produce cost thereby, improved the position in market competition. This company produced DCPD modified UPR 5 2006 10 thousand tons, add Changzhou other output of a few companies, UPR of modified of Changzhou area DCPD amounts to 100 thousand tons, occupy Jiangsu to save 1/3 of UPR total output about. Crop of this kind of colophony made an appointment with 150 thousand tons 2006, 13.6% what hold UPR total output, add up to needs DCPD 4.5 about 10 thousand tons. Wait for raw material price to answer benzene anhydride, suitable anhydride in recent years rise, colophony of not saturated polyester (UPR) industry puts forward “ and raw material to rise in price the slogan that becomes fight ” , deliver the view to ethylene the double-loop the fifth of the ten Heavenly Stem in deputy resource yield C5 2 Xi (DCPD) . 1, the history of UPR of preparation of use DCPD of home of current situation of DCPD UPR production, can the initial stage of industrialization of UPR of restrospect to our country. 20 centuries 60 time metaphase, academy of chemical industry of institute of Tianjin synthesis material, Beijing and factory of material of Tianjin city synthesis began the research that uses DCPD preparation UPR to work, synthesized material factory to realize industrialized production in Tianjin city at 60 time evening. The large-scale industrialization that DCPD uses at UPR only then at 20 centuries 80 time, at that time Jiangsu Changzhou inferior state chemistry limited company used DCPD in great quantities in the production of UPR, reduced colophony to produce cost thereby, the position in raising this company to compete in the market. 2006 Changzhou inferior UPR5 of modified of DCPD of production of state chemistry limited company 10 thousand tons, add Changzhou other output of a few companies, crop of colophony of UPR of modified of Changzhou area DCPD already amounted to 100 thousand tons, occupy Jiangsu to save the 1/3 of UPR total output about. Crop of this kind of colophony made an appointment with 150 thousand tons 2006, 13.6% what hold UPR total output, add up to needs DCPD4.5 about 10 thousand tons. 2, although the element that restricts DCPD application introduces after DCPD, UPR function had improve apparently with rise, but modified UPR crop holds UPR total output only 13.6% the left and right sides, investigate its reason has roughly the following at 5 o'clock: (1) environment pollution is serious. The DCPD purity that at present domestic UPR place uses has 82% ～ only 89% , the impurity of small element quantity that its contain produces the water that reaction place turns to generate along with ester ceaselessly in the process to come out from the depart in reaction system in UPR, the amount of small element compound of emergence of vacuumize of reaction later period is not little also, what these foreign matter place give out is effluvial let a person be borne hard. Take seriously increasingly as what work to environmental protection, DCPD will surely get to environmental pollution the interpose of environmental protection branch. All UPR of river shade city produced an enterprise to already signed the guarantee of DCPD of a disuse to environmental protection branch 2006, this is a signal that deserves attention: The waste gas that produces in the course that DCPD produces in UPR, waste liquid had arrived to be not processing cannot when, otherwise its apply will because of environmental protection problem be overruled thoroughly. (2)DCPD quickened what produce equipment to UPR to corrode, shortened the service life of equipment. (3)DCPD price climbs tall DCPD price all the way already 3100 yuan from 2003 / ton litre to the 10300 ～ 2006 10500 yuan / ton, photograph comparing of this and UPR of production of use benzene anhydride has done not have price advantage almost. (4)DCPD crop is insufficient, market gap is bigger always produced of our country ethylene 2005 already can amount to 11.86 million tons / year, deputy produce C5 to should be occupied 15% , among them DCPD and cent of CPD heat up in a steamer should amount to 200 thousand tons. But actually crop of our country DCPD had 40 thousand tons only 2005, and UPR of of the same age is 45 thousand tons of above to its consumption, the entrance measures about 5000 tons. Enter the situation is more grim 2006, the company go into operation that majority produces UPR with DCPD leads inadequacy 50% . DCPD demands exceeds supply, restricted its already badly to produce medium application in UPR. (5)DCPD modified UPR is put in flaw of a few quality, like colour and lustre deeper, mechanical intensity combats impact strength especially poorer, restricted its application in many domains.