The process of mercury emission reduction in PVC enterprises is obviously accelerated
The process of mercury emission reduction in PVC enterprises is obviously accelerated
Last October, China signed a contract to become a state party to the minamata convention on mercury. The amount of mercury in PVC used in China is 70% of the total amount. The ministry of environmental protection has requested that by the end of 2015, the use of low-mercury contact in PVC enterprises in China will reach 100 percent, and the high mercury catalyst will be eliminated altogether. Ningxia requires all PVC companies in the district to use low-mercury catalysts by the end of 2014. In late April, China chemical industry news reporter in an interview in ningxia, from the mandatory "mercury emissions" ban time only half a year time, ningxia local PVC enterprises generally tightened "limit mercury" nerve, speed up the implementation of the "high to low" mercury catalyst instead of technical modification progress and strive to win the battle of mercury pollution prevention.
Regulatory overtime to help reduce emissions
A PVC enterprises in ningxia, told China chemical industry news reporter, head of the PVC production, relevant departments have made it clear in ningxia, the whole autonomous region all PVC enterprises must be in the use of low mercury catalyst at the end of 2014, a year in advance do low-mercury catalyst instead of mercuric catalyst, the enterprise has high nerves tight again.
Head, department of environmental protection of pollution prevention and control in ningxia Jiang Xi explains, ningxia has comprehensively promote the use of low-mercury catalyst convenient conditions, so companies on scooped mercury emission is not difficult.
According to the introduction, ningxia jinhai chuangke chemical technology co., LTD. 's annual output of 6,000 tons of low-mercury catalyst and 6000 tons of waste mercury catalytic recycling project has been successfully put into production. The project is a demonstration project for the production and recycling of low-mercury catalysts in the northwest region, which is determined by the state planning, which provides a convenient way for enterprises to reduce their emissions. "If all ningxia PVC companies use low-mercury catalysts, the amount of mercury can be reduced by 50 per cent a year from the source, with a 70 per cent reduction in the flow rate of low-mercury catalysts." Jiang Xi said.
It is understood that in this year, the relevant departments of ningxia have stepped up their efforts to promote the use of low-mercury catalyst in local PVC enterprises and the supervision of "limited mercury". Specific measures include: PVC production enterprises of alternative work can not be completed within the time limit, shall not be renovated or expanded except pollution prevention and control of construction projects, to actively carry out low mercury catalyst to replace the use of PVC production enterprises, heavy metal pollution prevention and control of special funds to support the project mercury pollution prevention; To supervise the audit of compulsory cleaning production of PVC production enterprises, and the audit will be an important basis for enterprises to apply for environmental verification of environmental protection and environmental protection. We will urge PVC enterprises to establish a daily monitoring system and information disclosure system for mercury pollution, and to conduct an oversight monitoring every two months. Enterprises that fail to meet the standards should be governed by a deadline.
The speed of technical reform is obviously accelerated
Under the pressure of policy, the mercury emission reduction process of ningxia PVC enterprises is obviously accelerated.
"Our company has been in full swing low mercury catalyst using technology reconstruction project, this relates to the long-term development of the future, is also a good thing for us, the enterprise can take this further out on mercury backward technology and equipment, complete structure adjustment and upgrade." According to guo fusheng, assistant general manager of ningxia jinyu yuan chemical group co., LTD.
According to the introduction, jinyu yuyuan chemical group is currently producing 200,000 tons of calcium chloride in PVC devices, and 1.2 kg of mercury catalyst per ton of PVC, which requires a low mercury catalyst of 240 tons per year. Next, the company will take three to five years to expand the annual capacity of PVC to 400,000 ~ 600,000 tons, and annual sales revenue will exceed 5 billion yuan.
"Enterprises can better solve the existential crisis only by actively making the" high change low "mercury catalyst alternative projects. We now put the low-mercury catalytic technology into a key project, and we have experimented with the environment-friendly low-mercury catalyst in some of the converters. Achieve low mercury, catalyst consumption control in 1.2 kg, unit consumption of catalyst not only didn't rise, the overall is still in a downward trend, the device is completely up to the national standard level of cleaner production." "Guo said.
Also speeding up the pace of technical change is Ningxia Younglight Chemicals Co., Ltd. Their cs huang, director of the company to introduce to China chemical industry news reporter, the power, chemical industry has established the low-mercury catalyst to replace mercuric catalyst implementation scheme, and for the record to the environmental protection departments in ningxia, chlor-alkali branch and resin branch as early as 2010 began using low-mercury catalyst, the increasing maturity of the technology. In addition, in 2012, the British forces in the chemical industry also invest 14.1 million yuan to implement the wastewater deepen the governance project engineering, for mercury wastewater treatment unit, waste water, mercury online monitor and waste hydrochloric acid catalytic warehouse to take off the analysis unit technical renovation, reduced emissions of mercury pollution effectively, reduces the mercury pollution hazard. In 2013, the company took a low mercury catalyst to update the renovation work. After the renovation, the cost of the unit cost decreased by 11.85% year on year, and the cost of PVC unit decreased by 9.35% year on year.
"Now, the use of low-mercury catalysts has reached more than 50 per cent and companies plan to replace all of them with low-mercury catalysts by the end of 2014." "Mr Wong said.
Standard usage is a top priority
In the interview, China chemical news reporter learned that many ningxia PVC enterprises are promoting environmentally friendly low-mercury catalyst, but there are also concerns in the process.
Ningxia sea and chemical technology co., LTD., general manager of Chang Bingjie told China chemical industry news reporter, integrated production, low mercury catalyst advantages mainly embodied in the following aspects: one is the high mercury catalyst containing 10.5% ~ 12%, compared and disadvantages burning loss rate is higher, low mercury catalyst adsorption only 4% ~ 6.5% mass fraction of mercuric chloride and vinyl chloride reaction more stable and easy to control, enhances the catalyst poisoning and resistance to carbon deposition resistance, improve the thermal stability; Secondly, it is superior to the ordinary high mercury catalyst in reaction activity, selectivity and service life, and has better economic benefits. The third is the relative reduction of the secondary products, and the conversion efficiency is high.
However, some companies also reflect that the use of low-mercury catalysts in the early stage of the use of low-mercury catalysts has affected the initiative of mercury emission reduction in enterprises.
"It is reasonable to say that low mercury catalysts are not different from high mercury catalysts in terms of both operating indicators and economic indicators, and even more than high mercury catalysts. Some enterprises have less than 8,000 hours of low-mercury catalyst life, mainly due to improper operation and other factors. This issue should also be taken seriously by enterprises. "Said one person in charge of PVC business.
Chang Bingjie also thinks, the ningxia low-mercury catalyst to replace PVC enterprises do exist certain problems in use process, strengthen staff training, strict control of low-mercury catalyst using technical specification is the enterprise top priority.
On the one hand, he points out, the skill level of the operator needs to be improved. Compared with high mercury catalyst, low-mercury catalyst is filled with more stringent technical regulations, which directly affect its use effect. Some enterprises have not been trained in the technical training, think that as long as the catalyst can be loaded into the converter, a small amount or part of the converter can be used as a "bridging" phenomenon. The illegal operation also makes the filling density of the catalyst in each column of the chloroethylene converter device different, resulting in a large amount of sublimation of chlorinated mercury, which can shorten the life of the catalyst. On the other hand, there are some problems in the storage of mercury catalyst in some enterprises. The packaging bags are not tightly sealed and the storage time is too long, which can affect the effect of the use of mercury catalyst.
