不久就发现原油中的直馏煤油有时并不使人满意。
It was soon found that the kerosene straight from crude oil was sometimes not very satisfactory.
以中原原油直馏馏分为原料，用尿素络合法制得纯度较高的轻液体石蜡和低凝点煤油。
High purity light liquid paraffin and low condensing point kerosene are produced by urea complex using Zhongyuan crude oil distilling cut as raw materials.
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