The production technology of oil and fat chemical enterprises is relatively backward. Animal and vegetable oils and waste glycerol are mainly used as raw materials, and sodium sulfate is added to produce the finished sulfited animal and vegetable oils (leather additives). The produced wastewater contains high concentrations of COD (chemical oxygen demand) and BOD (biochemical oxygen demand), which is quite serious to the environment. The widespread problems in the industry such as small scale, backward production technology and serious environmental pollution are outstanding.

Upgrading of oil chemical industry. According to the plan, in 2007, the oil and fat chemical enterprises with unlicensed sales income of less than 500,000 yuan have been banned, while the oil and fat chemical enterprises with sales income of more than 500,000 yuan and relatively advanced production technology have reached the national environmental protection, safety production and hygiene standards by increasing technological transformation, so as to continue production.

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