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as the development of chemical industry has been penetrated and connected with related fields in science and technologies,pipeline transporting technology have become more and more“chemical” during the last 20 years, which makes many more kinds ofadvanced or specific transporting technology and execution (such astransportation of waxy crude oil with low throughput, the temporaryincreasing transportation in pipelines, and the paraffin control/paraffin removal) rely on chemical additives to achieve. forcontinually higher requirements of chemical additives are demandedby transporting technique, their applications and improvements hasbeen gradually evolved to a complicated system engineering, whichrefers to quite a few of subjects.
pour point depressant, hereinafter referred to as ppd, is achemical additive consisting of high molecular-weight polymer andgenerally used to improve the fluidity (flow property) of waxy oilsby reducing its pour point and viscosity, which can improve theoil’s fluidity in low temperature.

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