In maleic anhydride production plant, the water used in the process must be desalted water with potassium and sodium ion content less than 3ppm. The contents of crude maleic anhydride and potassium and sodium ions in process water and crude maleic anhydride storage tank should be detected regularly every day.

如果在脱水精制过程中发现粗顺酐中的钾、钠离子含量超过5ppm或工艺水中钾、钠离子含量超过3ppm时，都应暂时停止该批精制系统操作，并立即向管理部门报告，在得到管理部门同意后并在主管技术和管理人员的监督下完成该批精制操作，然后立即对脱水精制系统进行清洗操作。

If the content of potassium and sodium ions in the crude maleic anhydride exceeds 5ppm or the content of potassium and sodium ions in the process water exceeds 3ppm, the operation of this batch of refining system should be temporarily stopped and reported to the management department immediately. After obtaining the approval of the management department and under the supervision of the competent technical and management personnel, the batch of refining operation should be completed, and then the dehydration refining system should be started immediately Carry out cleaning operation.

如果工艺水储罐的工艺水中钾、钠离子超过3ppm，则应立即采取用合格的工艺水置换的方法，使工艺水储罐中的钾、钠离子含量合格。

If the potassium and sodium ions in the process water of the process water storage tank exceed 3ppm, the qualified process water shall be replaced immediately to make the potassium and sodium ions in the process water storage tank qualified.

如果粗顺酐储罐的粗顺酐中钾、钠离子超3ppm，则应严格监视蒸馏釜内的温度进行蒸馏操作，完成本批精制作业后立即清洗系统。

If the potassium and sodium ions in the crude maleic anhydride storage tank exceed 3ppm, the temperature in the still should be strictly monitored for distillation operation, and the system should be cleaned immediately after finishing this batch of refining operation.