Production process of high-purity isoolefine (tert-olefin)

A production process and isoolefin technology, which is applied in the field of high-purity isoolefin production process, can solve the problem of large loss of isoolefin products and achieve the effect of reducing emission losses

Active Publication Date: 2013-06-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the deficiency of this method is: because also contain a certain amount of isoolefins in the light distillate of isoolefin refining tower top, when discharging low molecular weight ether fraction, also unavoidably discharge a part of isoolefin products, make the isoolefin products The loss is relatively large, and the process needs to be further improved

Method used

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  • Production process of high-purity isoolefine (tert-olefin)
  • Production process of high-purity isoolefine (tert-olefin)
  • Production process of high-purity isoolefine (tert-olefin)

Examples

Experimental program
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Effect test

Embodiment 1

[0056] Process flow see attached image 3 , the hydrocarbon mixture containing methyl tert-butyl ether (from the methyl tert-butyl ether synthesis unit) enters the cracking reaction zone R1 through pipeline 1, wherein the content of methyl tert-butyl ether is about 98.5% (wt %) ( All the other compositions are shown in Table 1) The amount of raw material entering the cracking reaction zone R1 is 11000kg / h, the operating pressure of the reaction zone is 0.6MPa, and the operating temperature is 150°C. The reaction product P1 enters the water-washing separation tower L1 through the pipeline 2, and the operating pressure of the water-washing separation tower is 0.6MPa, the operating temperature is 40°C, the organic phase O1 mainly containing isoolefins, uncracked tertiary alkyl ether, and a small amount of low molecular weight ether is obtained at the top of the tower; the aqueous phase B1 mainly containing water and alcohol is obtained at the bottom of the tower.

[0057] Table 1...

Embodiment 2

[0068] Process flow see attached Figure 4 The difference from Example 1 is that the organic phase O6 at the top of the water washing separation tower L3 enters the olefin fractionation tower C1 through pipelines 23 and 6, and the flow direction of the remaining materials and the operating parameters of each device are the same as in Example 1.

[0069] Provided in table 3 are the flow and composition data of the aqueous phase at the bottom of each water-washing separation tower, the organic phase at the top of the alcohol fractionation tower, and the organic phase at the bottom of the isoolefin refining tower in this process.

[0070] table 3

[0071]

Embodiment 3

[0073] Process flow see attached Figure 5 , differs from Example 1 in that: the organic phase O6 at the top of the water-washing separation tower L3 enters the water-washing separation tower L2 through pipelines 23, 12, and the flow direction of all the other materials and the operating parameters of each device are all the same as in Example 1.

[0074]Table 4 shows the flow rate and composition data of the water phase at the bottom of each water washing separation tower, the organic phase at the top of the alcohol fractionation tower, and the organic phase at the bottom of the isoolefin refining tower in this process.

[0075] Table 4

[0076]

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Abstract

The invention relates to a production process of high-purity isoolefine (tert-olefin). The production process comprises a cracking reaction part, a washing part and a fractionating and refining part. The production process can adopt two implementation methods, namely fractionating and refining are carried out after water washing or fractionating and refining are carried out before water washing. In the production process, a low-molecular-weight ether washing separating column is added, so that light-component fractions which are separated from the top of an isoolefine refining column and contain low-molecular-weight ethers come into full contact with water in the washing separating column, accumulation of the low-molecular-weight ethers in the system can be effectively controlled and exhaust losses of isoolefine can be reduced; and meanwhile, new separating equipment is not added, thus lowering the cost and simplifying the operation.

Description

technical field [0001] The invention relates to a production process of high-purity isoolefins (tertiary olefins), in particular a process for preparing high-purity isoolefins by cracking tertiary alkyl ethers. technical background [0002] Isoolefins, especially high-purity isoolefins, are important raw materials for fine chemicals, as well as important intermediate raw materials or monomers for synthetic rubber and synthetic resins, such as high-purity isobutylene, which are widely used in the production of butyl rubber, polyisobutylene and methyl Various chemical products such as methyl acrylate. [0003] In the process of preparing isoolefins by cracking tertiary alkyl ethers, alcohol, one of the by-products of cracking, will undergo dehydration reaction under reaction conditions to generate low molecular weight ethers. When isoolefins are used as raw materials for synthetic rubber, their purity has a certain degree of For example, the content of dimethyl ether in high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/09C07C11/10C07C11/107C07C1/20C07C7/00C07C31/04C07C29/76
Inventor 姚振卫栗同林马英齐晓飞刘鑫何平贾志光
Owner CHINA PETROLEUM & CHEM CORP
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