Azeotropes in the in-depth analysis of hydrochloric acid
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Are there any manufacturers that have started producing hydrochloric acid through deep purification? What is the process used there? What to use as the anti-azeotrope?
Our factory does not use deep hydrolysis with hydrochloric acid, but I heard from a friend that they use Capronorlan technology, with calcium chloride
We are ready to use Capon Roland’s hydrochloric acid deep analysis technique, which provides calcium chloride
There were previously two companies in the country that used it (in the PVC industry), but both stopped production for different reasons. Currently, in China, Tianye and Haiji are the two companies that operate successfully, but the scale of in-depth analysis carried out by either of them is not large. It is also the calcium chloride method. It is recommended to consider the analysis method using concentrated sulfuric acid, as it effectively avoids the problem of crystalline blockage caused by calcium chloride. There are already many applications in other industries, so I won’t go into details!
Could you provide a detailed explanation of the process using concentrated sulfuric acid on the 4th floor?
By chance, I learned about the process for purifying concentrated sulfuric acid. Let me state clearly at the beginning: I’m not here to sell anything! The technology provider for this process is a foreign company that specializes in the production of glass-lined materials; as the name suggests, the main equipment used in this process is also made of glass lining. Its general process route is basically the same as that of the calcium chloride method. However, the following issues must be considered when using this process: 1. Discharge or utilization of waste sulfuric acid (environmental protection is important) ； 2. Accumulation of mercury in the cycle of concentrated sulfuric acid ； 3. The costs are relatively high compared to domestic quotes, and so on. I’ll stop here for now; I’ll provide a detailed report once I find the technical documents.
The PVC magazine provides an in-depth analysis of how Xinjiang Tianye utilizes waste hydrochloric acid; the azeotrope-breaking agent is calcium chloride. The advertisements in the magazine mention Hangzhou Zhonghao’s deep purification technologies, and several graphite equipment manufacturers in Nantong produce complete sets of deep purification equipment, which should also offer relevant process technologies. Those among us who have relevant information, as well as production and design experience in this field, could please share it for discussion!
An in-depth analysis of whether HCL is beneficial for us: energy consumption increases and costs rise, and most companies recycle HCL for the production of VCM; it is sufficient to depressurize hydrochloric acid to around 20% concentration. In my opinion, we should consider things from a different perspective and avoid excessive discussion on the deep depressurization of hydrochloric acid.
I don’t quite agree with the opinion of the user above. 1. Why do so many domestic companies blindly expand their production capacity? 2. To determine the necessity of implementing a set of systems, one should not consider only the costs; output and added value should also be taken into account. I rather think that a deep analysis device is sufficient to keep the costs of HCL synthesis and related facilities at an appropriate level. Therefore, the value of the HCL produced is sufficient to offset or even exceed the investment in the separation device. This post was last edited by wang*neng on 2009-1-4 11:17.]
Treating dilute acids is indeed difficult; it involves not only production costs but also environmental protection considerations. I agree quite a bit with the view expressed above.
It is difficult to sell dilute hydrochloric acid, and environmental protection considerations must also be taken into account; in-depth analysis can solve this problem.