Propylene refining technology
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Our company uses propylene for polymerization, but propylene contains impurities, which always results in poor polymerization quality. I am seeking a specialist with expertise in acrylic polymerization technology to provide it. I would like to express my gratitude here.
Propylene purification technology: The raw propylene passes through a solid alkali tower, a desulfurization tower, an activated alumina adsorption tower, and a 3-molecular-sieve hydrolysis tower in sequence to remove impurities such as moisture, sulfides, and oxygen. If the treatment does not meet the requirements on the first attempt, the process can be repeated for further purification.
If possible, additional units such as arsenic removal towers and deoxygenation towers can be added; the more, the better:lol
To be honest, propylene is available in two grades: polymer-grade and chemical-grade. I suggest using the polymer-grade material, as this will reduce the need for additional refining equipment. All that’s required is a stripping tower to remove CO and ethane, followed by an absorption tower with molecular sieves, after which the material can be fed into the process. Last edited by cswenhan on 2009-3-6 09:42.]
As long as the requirements for the polymerization reaction are met, more is fine; however, having too much leads to increased costs.
For propylene purification, it is first necessary to analyze which impurities in propylene have an impact on polymerization. This can be based on the requirements for impurities specified in the polypropylene patent technology. If the impact of certain impurities is known, then consider installing refining facilities.
If the source of raw materials is inconsistent, it’s better to use more refining towers as a safety measure; otherwise, it’s possible that production will stop at some point, and fixing the issue will take several days, resulting in huge losses!
Here we have used only one tower for desulfurization, phosphorus, and arsenic removal – a combined tower – and I’m not sure what the results are
It is recommended to purchase high-quality propylene raw material free from sulfur, phosphorus, arsenic, etc. Standard: Grade 1 products have an acrylene content of 99.3% or more, 0.6% propane, along with trace amounts of other light components. Premium grade: 99.6% or higher.
By installing a gas diversion system, high-purity propylene can be obtained, and the tensile strength of the products synthesized in our factory exceeds the national standard by 12%
For small-scale polypropylene production units, the propylene purification system should ideally include a drying and dehydration tower, as well as a COS removal hydrolysis tower, a desulfurization tower, a deoxidation tower, and an arsenic removal tower. This way, impurities such as sulfur, arsenic, and oxygen in the propylene can be thoroughly removed before it is used for polymerization, and that’s ideal!