Develop multipurpose dioctyl phthalate

Dioctyl phthalate is the most widely used, the largest output plasticizers are phthalate plasticizers, the most important species, in addition to cellulose acetate, polyvinyl acetate, but the vast majority of synthetic resin and rubber have good compatibility. DOP as a primary plasticizer, widely used in all kinds of soft products processing, such as film, sheet, leather, cable and molded goods. Dioctyl phthalate, non-toxic and can be used in contact with food packaging materials, but because fat out easily, it is not appropriate for fatty food packaging materials. In a variety of synthetic rubber, DOP also a good softening effect. In addition, DOP also as a condensing agent, antifriction agents, organic solvents, such as gas chromatography stationary phase.

The international community has abolished without catalyst technology, there is only an acidic catalyst and non-acidic catalysts two processes. Because high activity of the catalyst sulfuric acid, the esterification process more side reactions occur, affecting the quality of DOP. Rhonepoulenc France, Germany Ruhr company KBC Chemical Company, Exxon U.S. Monsanto and sulfuric acid catalyst technology is still used, but the set of by-product acid, dioctyl ether, dioctyl decomposition loop alcohol extraction hydrogenation and wastewater treatment equipment, while strengthening and washing and removal of alcohol, drying, bleaching process, greatly improving the quality of products. A wide range of non-acidic catalyst, mainly aluminum compounds, first Ⅵ element compound, alkali metal oxides, such as element compound Ⅴ. Process can be said to represent the non-acidic catalyst DOP development. 1998 90% of DOP production is the use of non-acidic catalyst production, DOP production has been concentrated to the 10 large enterprises, which is to improve the quality of our products is very good DOP.

Currently plasticizer production technology trends, on the one hand is the main continuous large-scale production of plasticizers, phthalate plasticizers plasticizers consumption accounts for about 80% of total production is large , so we had to dioctyl phthalate as the center of continuous large-scale production, such as BASF's a set of continuous production unit DOP production capacity has reached 100,000 t / a or more. Partly because the plasticizer varieties, and special varieties of production is relatively small, in order to meet the requirements of many varieties of small batch production, the use of the similarity of the production process plasticizers, generally carried out using a common batch production unit Rotation production, such as the U.S. Chemical Company Lai Kehuo 1 sets of production equipment, meet this requirement is established, the device usually can process more than 60 kinds of raw materials, production of phthalic acid esters, adipic acid esters, azelaic esters, sebacic acid esters, maleic acid esters, fumaric acid esters, trimellitic acid ester, epoxy compound, a polyester, 30-40, species of the United States 95% of the plasticizer used.

Pre:DOP into the adjustment phase    Next:DOP into the adjustment phase