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Method for producing isopentane product

A production method, the technology of isopentane, which is applied in the direction of adsorption purification/separation, organic chemistry, etc., can solve the problems such as no high-purity isopentane products, and achieve improved cycle adsorption capacity, high selectivity, and increased desorption push force effect

Inactive Publication Date: 2017-01-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the reported literature, most of the whole cut naphtha is used as the raw material to produce ethylene feedstock, gasoline blending material and solvent oil products, and there is no relevant report on the production of high-purity isopentane products using rectification-adsorption coupling technology

Method used

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  • Method for producing isopentane product
  • Method for producing isopentane product
  • Method for producing isopentane product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Using light naphtha as raw material and SAPO-17 aluminum phosphate molecular sieve as adsorbent, the composition of light naphtha is shown in Table 1, and the distillation-adsorption coupling process flow is as follows figure 1 shown.

[0035] Compound name Content (wt. %) Isobutane 0.71 n-butane 3.12 Isopentane 38.36 n-pentane 11.42 2,2-Dimethylbutane 0.19 2,3-Dimethylbutane 5.91 2-Methylpentane 24.81 3-Methylpentane 11.45 n-Hexane 2.08 Methylcyclopentane 1.33 benzene 0.62

[0036] The four-tower (T1, T2, T3, T4) pressure swing adsorption cycle process and time distribution are shown in Table 2. The time of a pressure swing adsorption cycle is 20 minutes, of which adsorption is 5 minutes, average pressure drop is 2.5 minutes, reverse discharge is 2.5 minutes, Desorb for 5 minutes, equalize pressure for 2.5 minutes, and pressurize for 2.5 minutes.

[0037] Table 2 Process and time allocat...

Embodiment 2

[0042] Such as figure 2 shown. The pressure swing adsorption process, specific operation process and steps are the same as in Example 1. The difference is that the adsorption temperature is 60° C., the adsorption pressure is 0.1 MPa, and the desorption adopts vacuuming while using N 2 Purging, the desorption pressure is 0.05MPa, the desorbed N2 and the desorbed oil mixture 10 are condensed into the gas-liquid separation tank V1 through the desorption oil heat exchanger E4, and the n-pentane (desorbed Oil 8) then enters the desorption oil storage tank F3; the cycle N separated from the gas-liquid separation tank V1 2 9 and Fresh N 2 11 was used again for purge desorption. The content of the obtained isopentane product was 99.4wt%.

Embodiment 3

[0044] Using oilfield light hydrocarbons as raw materials and mordenite as adsorbent, the composition of oilfield light hydrocarbons is shown in Table 3, and the schematic diagram of the coupling process of rectification and six-column adsorption is shown in image 3 shown.

[0045] Compound name Content (wt. %) Isobutane 1.33 n-butane 24.37 Isopentane 38.53 2-Methyl-1-butene 0.27 n-pentane 26.61 2-Methyl-2-butene 0.05 2,2-Dimethylbutane 2.34 Cyclopentane 5.58 2-Methylpentane 0.92

[0046] The pressure swing adsorption and time distribution of the six towers (T1, T2, T3, T4, T5, T6) are shown in Table 4. During the adsorption cycle, there are always two adsorption towers simultaneously adsorbing and desorbing, and one pressure swing adsorption cycle is 24 minutes, including adsorption for 6 minutes, average pressure drop for 1.5 minutes, reverse discharge for 1.5 minutes, desorption for 5 minutes, average pr...

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Abstract

The invention relates to a method for producing an isopentane product. The method comprises the following steps: feeding a hydrocarbon mixture rich in isopentane into an adsorption separation unit, wherein the adsorption separation unit comprises at least four adsorption towers which are connected in parallel and are operated in an alternative circulation manner; enabling the adsorption towers to operate in an alternative mode within one cycle so as to achieve the purposes of complete circulation to continuous operation, and performing adsorption, pressure drop equalization, reversed discharge, desorption, pressure increase equalization and stamping in each cycle. A distillation-adsorption coupling process is adopted in the method, high-performance adsorbent is used in the adsorption separation unit, the adsorbent is good in isopentane selectivity and regeneration effect, and compared with conventional multi-tower precise distillation, the method is low in energy consumption and relatively high in purity and yield of an isopentane product.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for producing a high-purity isopentane product, and more specifically to a process for producing a high-purity isopentane product through a rectification-adsorption coupling process. Background technique [0002] Isopentane, whose chemical name is 2-methylbutane, is a colorless, transparent, volatile liquid that is insoluble in water but miscible in most organic solvents such as ethanol and ether. Isopentane products have a wide range of uses and can be used as foaming agents, solvents, and chemical raw materials. Isopentane can be compounded with n-pentane for XPS (expandable polystyrene), EPS (expanded polystyrene foam) foaming agent, and can also be compounded with cyclopentane for rigid polyurethane Foam blowing agent; Isopentane is also used as a solvent for catalysts in polyethylene production and as a deasphalting solvent. In addition, isopentane can be used to ...

Claims

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Application Information

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IPC IPC(8): C07C7/13C07C9/18
Inventor 刘宗健崔群汪洋陈韶辉王海燕李晓强殷飞
Owner CHINA PETROLEUM & CHEM CORP
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