采用硫氰酸钠为溶剂，湿纺一步法工艺生产腈纶，探讨了喷丝头负拉伸率对纤维成形的影响。
Using NaSCN as solvent, acrylic fiber was produced by one-step wet spinning process. The effect of spinneret negative draw ratio on fiber formation was discussed.
而从具有最低恒沸点的混合溶剂中吸附溶质时，吸附量与溶剂组成的关系与直线呈负偏差。
From constant boiling mixtures with a minimum, the adsorption of solutes also varies with the composition of mixed solvents, but a negative deviation is observed.
负压蒸发蒸发效率高，脱溶彻底，毛油中溶剂消耗低。
Vacuum evaporation features high efficiency, thorough de-solvation and low solvent consumption in crude oil.
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