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Method for preparing dihydric alcohol mono-t-butyl ether

A technology of mono-tert-butyl ether and diol, which is applied in the field of chemical preparation process, can solve the problem of low selectivity and achieve the effect of high selectivity

Inactive Publication Date: 2015-01-07
ZHUHAI FEIYANG NOVEL MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this kind of preparation method still has the shortcoming that reaction can produce 15-30% by-product, and the selectivity of reaction is on the low side

Method used

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  • Method for preparing dihydric alcohol mono-t-butyl ether
  • Method for preparing dihydric alcohol mono-t-butyl ether

Examples

Experimental program
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Embodiment 1

[0022] In the above method, the dihydric alcohol is at least one of ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, triethylene glycol, tripropylene glycol, hexylene glycol, and octapentyl glycol.

[0023] The feature of this patent is that, compared with raw materials and corresponding products, it is more important for dihydric alcohols to be able to react with carbon four, so several dibasic alcohols provided in this example are obtained by the applicant in combination with a large number of repeated experiments. The products suitable for the patented process are screened out, and all can well participate in the reaction in the process.

Embodiment 2

[0025] In the above method, the liquefied petroleum gas includes a hydrocarbon mixture with an atomic number of 4; the hydrocarbon mixture includes isobutene with a content of 20%-99%.

[0026] In this embodiment, if the isobutene content in the C4 hydrocarbon mixture is less than 20%, the yield of the diol mono-tert-butyl ether compound decreases, and the reaction efficiency may decrease. Therefore, when selecting the C4 hydrocarbon mixture, it should be greater than 20%, preferably more than 30%.

Embodiment 3

[0028] In the above method, the hydrocarbon mixture further includes dihydric alcohol; the molar ratio of dihydric alcohol to isobutylene is 1:1-4:1.

[0029] Through repeated experiments, it has been found that if the molar ratio of isobutylene and diol compound is less than 1:1, the efficiency of the catalytic reaction will be too low, and when it is greater than 4:1, the unreacted diol will increase, and the cost of the recycling reaction will be increased. The increase in investment will increase the cost more. Therefore, this embodiment proposes a molar ratio of diol to isobutylene that better balances the above-mentioned advantages and disadvantages after a lot of creative work, that is, 1:1-4:1. Further, 1.5:1-2.5:1 can be optimally selected.

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Abstract

The invention provides a method for preparing dihydric alcohol mono-t-butyl ether. The method comprises the following steps: carrying out an alkylation reaction on dihydric alcohol, liquefied petroleum gas and acid catalyst at 40-100 DEG C and 0.5-5.0MPa to obtain the dihydric alcohol mono-t-butyl ether. The method has the beneficial effects that the liquefied petroleum gas containing isobutene is used as a reaction raw material and matched with dihydric alcohol and acid catalyst, and the contact time and reaction temperature of reaction materials are controlled, thus a high-selectivity dihydric alcohol mono-t-butyl ether crude product can be obtained.

Description

technical field [0001] The invention relates to a process for preparing chemicals, in particular to a method for preparing diol mono-tert-butyl ether. Background technique [0002] Since the chemical structure of diol mono-tert-butyl ether has two groups with strong solubility: ether bond and hydroxyl group, the ether bond has lipophilicity and can dissolve hydrophobic compounds; while the hydroxyl group has hydrophilicity and can dissolve Dissolves water-soluble compounds, so diol mono-tert-butyl ether is a general-purpose solvent with excellent performance. It is widely used in many aspects, mainly used as industrial solvents, and in the fields of paints and coatings, it is used as a high-boiling solvent and can be used as an endower Leveling effect. [0003] It can be seen that diol mono-tert-butyl ether is a very useful chemical. In the prior art, diol mono-tert-butyl ether is usually prepared by reacting tert-butanol with ethylene oxide or propylene oxide. This metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/13C07C41/06
CPCC07C41/06C07C43/13
Inventor 肖增钧邱小勇姜雄邓锦新莫志文
Owner ZHUHAI FEIYANG NOVEL MATERIALS
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