This thesis discusses the key technological control to three-difference intermingled filement PET FDY yarn in which the difference of the different contraction late between the both constituents is 10%.

Analysis of finite-element strength of reducer tee;

Synthesis of diisopropylbenzene and triisopropylbenzene by heterogeneous catalytic method;

Appropriate readjustment of technology, we can produce high quality PET FDY(50 dtex/36 f) low denier bright tri angle filament on ordinary FDY produce line.

used for dyeing and finishing of polyester microfibers and fibers with different titers/cross sections/contractions, such as weaving sizes and oils,scouring agents, alkaline deweighting agents, dyeing auxiliaries and water_and oil_repellents etc.

The Production of Side Chain Dodecylphenol by Triisobutene

A large mumber of by-product triisobutene are produced while disisobutene producing in refinery, but it has not been utilized efficiently at present.