Lumusphane alkylation

We can discuss this here as well; feel free to raise any questions. Many issues related to the petrochemical industry are interconnected, and by discussing them together with experts from various fields, we can come up with broader perspectives and more comprehensive solutions

I’m very looking forward to giving a detailed introduction

An alkylation unit is a gas processing device that uses olefins and isobutane present in liquefied gas as raw materials; under the action of a catalyst, these olefins react with isobutane to produce alkylated oil. The purpose of hydrorefining the feedstock is to remove butadiene from it through hydrogenation. Since butadiene is the main harmful impurity in alkylation reactions, it forms polymeric structures with multiple branches during these reactions, which raises the dry point of the alkylated oil and increases acid consumption. Selective hydrogenation technology is used to remove butadiene from the feedstock; this technology has been applied in multiple alkylation units in China and is considered a mature technology there. Due to the insufficient alkene-to-alkane ratio in the unreacted C4 fraction provided by the gas separation unit, some isobutane needs to be added. Therefore, a MEK unit is employed to mix butane with part of the mixed C4 fraction for selective hydrogenation; the C4 fraction obtained after hydrogenation is then fed into a distillation column to separate out the C4 fraction that meets the requirements for alkylation. The alkylation processes using liquid acids as catalysts can be divided into sulfuric acid alkylation and hydrofluoric acid alkylation; both of these processes are mature technologies that are widely used both domestically and internationally. This unit utilizes LUMMUS Company’s sulfuric acid alkylation process, which features the following advantages: 1) The CDALKY low-temperature sulfuric acid alkylation process operates at -4°C; operating at such a low temperature allows for a lower alkene to oxygen ratio (I:O) compared to traditional alkylation processes, thereby significantly reducing the energy consumption of the deisobutane column reboiler. The reactive effluent self-cooling process is employed: the liquid propane and butane present in the reactive effluent undergo vacuum flashing in the filler section of the reactor, thereby absorbing the heat released during the alkylation reaction. After gas-liquid separation of the reaction effluent, the gas phase is compressed again by a compressor and condensed; after some propane is extracted, it is recycled back to the reactor. The effluent from the refrigeration process enables a high isobutane concentration to be maintained in the reactor, while minimizing the amount of recycled isobutane from the isobutane removal column. 2) Compared with the traditional sulfuric acid-based alkylation process, the CDALKY low-temperature sulfuric acid alkylation process uses two dedicated vertical, scalable reactors to produce 600,000 tons of alkylated oil. By eliminating mechanical stirring equipment and implementing post-treatment of the reactor effluents, the vertical reactors **improve the operational efficiency and reliability of the plant. The reactor does not use mechanical stirring, which eliminates the limitation posed by the high viscosity of the acid emulsion at low temperatures; as a result, it can operate at -4°C. The operation of CDALKY at low temperatures reduces side reactions and increases the selectivity for C8, resulting in a final product with a higher octane number and better quality. 3) The reaction effluent is not treated using concentrated acid or alkaline wash processes: The treatment section for the reaction effluent in the CDALKY process consists of a primary coalescer, a secondary coalescer, and a supplementary coalescer; the HC coalescer and the LC coalescer are each equipped with their own coalescing systems. There is no need for an alkaline water washing system (neither the equipment nor the corresponding tanks, pumps, and mixers are required). 4) This process employs a two-column distillation system, consisting of an isobutane removal column and a n-butane removal column, to separate the alkylated oil, isobutane, and n-butane. Isobutane is returned to the reactor, and since there is no need to wash the reaction effluent with alkaline water, the entire CDALKY distillation section is dry. Without water present, corrosion is virtually eliminated, thereby significantly reducing equipment maintenance costs and the likelihood of unplanned shutdowns. 5) The reduced number of CDALKY reactors results in a much smaller floor area compared to traditional sulfuric acid alkylation plants that use multiple horizontal reactors; a smaller floor area inevitably leads to lower costs for infrastructure such as piping and ductwork. Reference location: http://bbs.hcbbs.com/thread-1263546-1-1.html

Has the liquefied gas and alkylation oil in your alkylated waste acid been recovered? Liquefied gas and alkylated oil inside have great economic value. Communicate on QQ1472359555.

Alkene to alkane, one to zero? ? ? ? ? Was it written wrong?

Could you be more professional? :P:P:P I:O refers to the alkene-to-alkane ratio, where I represents the alkane ； O refers to olefins.

We are currently researching molecular sieve solid acid alkylation catalysts and processes.

“Technical exchanges on alkylation and spent acid \"can be discussed.\"