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Process for synthesizing p-methoxystyrene from p-methoxyphenethyl alcohol

A technology of methoxystyrene and p-methoxybenzene, which is applied in the gas-solid-phase catalytic dehydration of p-methoxyphenylethanol to generate p-methoxystyrene and the synthesis process field of p-methoxystyrene, which can solve the problem of Complex process route, many raw and auxiliary materials, easy to polymerize and other problems, to achieve the effect of simple equipment structure, simple process, and reduce environmental pollution

Inactive Publication Date: 2014-07-16
NANJING POLYTECHNIC INSITUTE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These complex process routes, many raw and auxiliary materials, and long reaction cycles are not conducive to continuous industrial production; and the generated p-methoxystyrene cannot be removed from the reactor in time, so it is prone to polymerization

Method used

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  • Process for synthesizing p-methoxystyrene from p-methoxyphenethyl alcohol

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Embodiment Construction

[0013] First put 30ml porcelain beads into the bottom of the reactor, then put 100ml catalyst into the middle and lower part of the reactor, and then fill the upper part of the reactor with porcelain beads. Connect the vaporizer to the reactor and the condenser to the reactor. Check whether there is enough p-methoxyphenethyl alcohol in the raw material tank, turn on the water circulation vacuum pump, and check whether the vacuum degree can meet the requirements to prevent air leakage. After the inspection, turn on the water circulation vacuum pump and turn on the electric heating to heat up the vaporizer and reactor. When the vaporization temperature reaches 270°C and the reaction temperature reaches 275°C, slowly open the regulating valve so that the flow rate of the flowmeter is 0.3-0.5ml / min, and slowly increase the feeding amount during the reaction, and the feeding amount does not exceed 1ml / min, and adjust the feeding through the regulating valve amount to stabilize the...

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Abstract

The present invention relates to a p-methoxystyrene synthesis process, specifically to production of p-methoxystyrene through gas-solid phase catalysis dehydration of p-methoxyphenethyl alcohol. The synthesis process is a continuous production process, and specifically comprises that: p-methoxyphenethyl alcohol is sucked through a water circulation vacuum pump, the feeding amount is adjusted through an adjustment valve, vaporization is performed with a vaporization device, the obtained material enters a reactor, a catalysis dehydration reaction is performed at a temperature of 275 DEG C, the obtained reaction gas is condensed into a liquid, and the liquid enters a product receiver. According to the present invention, the process has characteristics of simple process, mild process conditions, safe operation, single raw material and product, high selectivity, high yield, no by-product emission, low environmental pollution, simple structure of the required equipment, application of ordinary carbon steel, and no special requirement.

Description

technical field [0001] The invention relates to a synthesis process of p-methoxystyrene, which belongs to the technical field of chemical industry, and specifically involves the gas-solid phase catalytic dehydration of p-methoxyphenethyl alcohol to generate p-methoxystyrene. Background technique [0002] P-methoxystyrene is also known as 4-methoxystyrene, 4-vinylphenetole, aromatic vinyl compounds. Since the side chain is a C=C double bond, its chemical properties are relatively active. The compound can polymerize slowly at room temperature, and it needs to add a polymerization inhibitor (stabilizer) to store it. It can be self-polymerized (homopolymerized) or copolymerized with other unsaturated compounds. It is a very important chemical raw material and is widely used in materials, pharmaceutical intermediates, adhesives, coatings, sunscreens and other fields. The polymer of p-methoxystyrene has a protective group that is easily acid-degradable when exposed to light. It ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/215C07C41/18
CPCC07C41/18C07C43/215
Inventor 吴永贵
Owner NANJING POLYTECHNIC INSITUTE
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