Sewage treatment in the production of propylene oxide is a worldwide problem. This problem was recently solved by Chinese companies. On December 26th, Shandong Dongda Chemical Co., Ltd. put into operation the first phase of wastewater reuse, marking China's breakthrough in this area.
The full name of the project is the use of multi-effect evaporation recovery of calcium chloride saponification wastewater recycling distilled water project. The basic description of the working principle is to use multi-effect evaporation to concentrate the concentration of calcium chloride in the waste water to about 65% to 70% and process it into finished products for sale; the condensed water produced in the process is returned to the production workshop. During the course of various complicated heating and reaction processes.
The project was jointly invested, designed and constructed by Dongda and Guangzhou Zhongwan Wandai Environmental Engineering Co., Ltd. The scientific and technical personnel of both parties worked together to complete the small-scale test and the mid-scale test, passed the national, provincial and municipal environmental protection experts' argumentation, and applied for national patents and intellectual property protection of 13 developed countries. The total investment of the project is 120 million yuan. At present, the first phase of an investment of 30 million yuan is completed. It can produce 30,000 tons of calcium chloride annually and condense water to recover 660,000 tons. The investment can be recovered within three years.
It is reported that at present there are more than 10 propylene oxide production enterprises in China, all adopting the chlorohydrin process, and the equipment containing calcium chloride wastewater generated during the production process has seriously polluted the environment. At present, domestic counterparts adopt the method of adding fresh water and then biochemical treatment. To treat 1 ton of waste water requires 1.5 tons of fresh water. For example, Dongda, before the implementation of this project, it takes about 6,000 tons of diluted water every day, and the treated wastewater cannot be reused due to high salt content, and the water resources are wasted.
The full name of the project is the use of multi-effect evaporation recovery of calcium chloride saponification wastewater recycling distilled water project. The basic description of the working principle is to use multi-effect evaporation to concentrate the concentration of calcium chloride in the waste water to about 65% to 70% and process it into finished products for sale; the condensed water produced in the process is returned to the production workshop. During the course of various complicated heating and reaction processes.
The project was jointly invested, designed and constructed by Dongda and Guangzhou Zhongwan Wandai Environmental Engineering Co., Ltd. The scientific and technical personnel of both parties worked together to complete the small-scale test and the mid-scale test, passed the national, provincial and municipal environmental protection experts' argumentation, and applied for national patents and intellectual property protection of 13 developed countries. The total investment of the project is 120 million yuan. At present, the first phase of an investment of 30 million yuan is completed. It can produce 30,000 tons of calcium chloride annually and condense water to recover 660,000 tons. The investment can be recovered within three years.
It is reported that at present there are more than 10 propylene oxide production enterprises in China, all adopting the chlorohydrin process, and the equipment containing calcium chloride wastewater generated during the production process has seriously polluted the environment. At present, domestic counterparts adopt the method of adding fresh water and then biochemical treatment. To treat 1 ton of waste water requires 1.5 tons of fresh water. For example, Dongda, before the implementation of this project, it takes about 6,000 tons of diluted water every day, and the treated wastewater cannot be reused due to high salt content, and the water resources are wasted.
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