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Method for preparing propionic aldehyde from ethylene in refinery dry gas

A refinery dry gas and ethylene technology, applied in the fields of carbon monoxide reaction preparation, organic chemistry, etc., can solve problems such as failure to provide, and achieve the effects of small equipment investment, simple process and low energy consumption

Active Publication Date: 2014-08-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] None of the above-mentioned homogeneous reaction patents provides a method for simultaneously utilizing ethylene and hydrogen contained in refinery dry gas, and directly carrying out hydroformylation reaction to prepare propionaldehyde without changing the gas raw material concentration

Method used

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  • Method for preparing propionic aldehyde from ethylene in refinery dry gas
  • Method for preparing propionic aldehyde from ethylene in refinery dry gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In the first step, the refinery dry gas with a pressure of 0.7Mpa is increased to 2.3Mpa through the compression system to form high-pressure refinery dry gas.

[0034] In the second step, the dry gas of the refinery containing 12.5% ​​(mole content) of ethylene, 26% (mole content) of hydrogen, and methane, ethane, nitrogen, a small amount of propane, propylene, carbon dioxide, etc., is controlled by a flowmeter at 5000ml / min The flow rate passes through the purification device, and the dry gas of the refinery contains 10 ppm of carbonyl iron, 150 ppm of hydrogen sulfide, 70 ppm of oxygen, 3000 ppm of acetylene, and 3000 ppm of water. The purification device consists of five fixed-bed reactors connected in series, and each fixed-bed reactor can individually control the temperature. They are carbonyl iron purification tower, hydrogen sulfide purification tower, oxygen purification tower, acetylene purification tower, and water purification tower. The carbonyl iron purifica...

Embodiment 2

[0038] In the first step, the refinery dry gas with a pressure of 0.7Mpa is increased to 1.5Mpa through the compression system to form high-pressure refinery dry gas.

[0039] In the second step, the dry gas of the refinery containing 12.5% ​​(mole content) of ethylene, 26% (mole content) of hydrogen, and methane, ethane, nitrogen, a small amount of propane, propylene, carbon dioxide, etc., is controlled by a flowmeter at 4000ml / min The flow rate passes through the purification device, and the dry gas of the refinery contains 10 ppm of carbonyl iron, 150 ppm of hydrogen sulfide, 70 ppm of oxygen, 3000 ppm of acetylene, and 3000 ppm of water. The purification device consists of five fixed-bed reactors connected in series, and each fixed-bed reactor can individually control the temperature. They are carbonyl iron purification tower, hydrogen sulfide purification tower, oxygen purification tower, acetylene purification tower, and water purification tower. The carbonyl iron purifica...

Embodiment 3

[0043] In the first step, the refinery dry gas with a pressure of 0.7Mpa is increased to 1.8Mpa through a compression system to form high-pressure refinery dry gas.

[0044] In the second step, the dry gas of the refinery containing 10.5% (mole content) of ethylene, 23% (mole content) of hydrogen, and methane, ethane, nitrogen, a small amount of propane, propylene, carbon dioxide, etc., is controlled by a flowmeter at 5000ml / min The flow rate passes through the purification device, and the dry gas of the refinery contains 20ppm carbonyl iron, 120ppm hydrogen sulfide, 50ppm oxygen, 3100ppm acetylene, and 3500ppm water. The purification device consists of five fixed-bed reactors connected in series, and each fixed-bed reactor can individually control the temperature. They are carbonyl iron purification tower, hydrogen sulfide purification tower, oxygen purification tower, acetylene purification tower, and water purification tower. The carbonyl iron purification tower is equipped w...

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Abstract

The invention discloses a method for preparing propionic aldehyde from ethylene in refinery dry gas so as to provide a technology for directly preparing propionic aldehyde from low-concentration ethylene in refinery dry gas. The method comprises the following steps: pressurizing raw dry gas in a pressurization system; feeding the obtained high-pressure dry gas into a purification system, and removing impurities; mixing the purified refinery dry gas and carbon monoxide containing no catalyst poison to form raw gas for hydroformylation reaction; carrying out hydroformylation reaction together with additional carbon monoxide under the action of a catalyst and a catalyst ligand; and discharging in a gas phase manner, and passing through a separation system, thus obtaining the propionic aldehyde product.

Description

Technical field [0001] The invention relates to a method for utilizing ethylene in dry gas in a refinery, in particular to a method for directly using ethylene and hydrogen in the dry gas in a refinery to react with carbon monoxide to prepare propionaldehyde. Background technique [0002] Refinery dry gas mainly comes from the secondary processing of crude oil, such as catalytic cracking, thermal cracking, delayed coking, etc. Among them, catalytic cracking has the largest amount of dry gas and the highest yield. Refinery dry gas contains 10-20% ethylene, 20-40% hydrogen, nitrogen, methane, ethane and a small amount of carbon monoxide, carbon dioxide, propane, propylene, etc. [0003] The use of refinery dry gas as raw material for ethylene plants in foreign refineries has been industrialized as early as the 1980s. The structure and layout of domestic oil refining and chemical companies are quite different from those of foreign countries. First of all, domestic oil refining compa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C47/02C07C45/50
Inventor 王世亮吕顺丰黄凤兴李彤刘博秦燕璜
Owner CHINA PETROLEUM & CHEM CORP