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Method for removing aldehyde and ketone in HPPO process by molecular sieve catalytic reaction

A catalytic reaction and molecular sieve technology, applied in molecular sieve catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of difficult wastewater treatment, frequent regeneration, and high safety requirements, and achieve long service life, long single-pass life, and regeneration. good effect

Active Publication Date: 2019-07-12
JIANGSU YANGNONG CHEM GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, aldehydes and ketones are often removed by methods such as amine-containing organic matter, adsorption, hydrogenation, etc., but there are problems such as difficult wastewater treatment, frequent regeneration, and high safety requirements.

Method used

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  • Method for removing aldehyde and ketone in HPPO process by molecular sieve catalytic reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Mix NaY molecular sieve and 0.3mol / L ammonium chloride solution according to the liquid / solid weight ratio of 3, exchange at 90°C for 4h, filter with molecular sieve, rinse, dry at 105°C for 5h, and roast at 500°C for 5h, repeat the above steps 3 times , to obtain a modified molecular sieve catalyst.

[0023] The above-mentioned modified molecular sieve catalyst is loaded into a tubular fixed bed, the aspect ratio of the catalyst bed is 100, and the circulating methanol (aldehyde and ketone impurity content 2500ppm) from the HPPO process is used at a volume space velocity of 0.5h -1 Pumped into a tubular fixed bed, treated at 75°C and 4MPa, the initial discharge contains 3 ppm of aldehydes and ketones, and 4,892 ppm of acetals and ketals. It is required that the output index of aldehydes and ketones impurity index is less than or equal to 8ppm, and the operating time of the device is 1200h.

[0024] The above-mentioned catalyst to be treated is first purged with nitrog...

Embodiment 2

[0026] Mix NaY molecular sieve and 0.2mol / L stannous chloride solution according to the liquid / solid weight ratio of 2, exchange at 60°C for 8h, filter with molecular sieve, rinse, dry at 105°C for 5h, roast at 500°C for 5h, repeat the above steps for 5 hours Second, a modified molecular sieve catalyst was obtained.

[0027] The above-mentioned modified molecular sieve catalyst is loaded into a tubular fixed bed, the aspect ratio of the catalyst bed is 50, and the circulating methanol (aldehyde and ketone impurity content 1000ppm) from the HPPO process is used at a volume space velocity of 2h -1 Pumped into the reactor, treated at 60°C and 3MPa, the initial output aldehyde and ketone impurity content was 8ppm, and the acetal ketal content was 1902ppm. It is required that the output index of aldehydes and ketones impurity index is less than or equal to 12ppm, and the operating time of the device is 1600h.

[0028] The above-mentioned catalyst to be treated is first purged with...

Embodiment 3

[0030] Mix MCM-22 molecular sieve and 0.1mol / L ammonium chloride solution according to the liquid / solid weight ratio of 4, exchange at 95°C for 4h, filter with molecular sieve, rinse, dry at 105°C for 5h, and roast at 550°C for 7h, repeat the above steps 4 times to obtain a modified molecular sieve catalyst.

[0031] The above-mentioned modified molecular sieve catalyst is loaded into a tubular fixed bed, the aspect ratio of the catalyst bed is 50, and the circulating methanol (aldehyde and ketone impurity content 200ppm) from the HPPO process is used at a volume space velocity of 4h -1 Pumped into a tubular fixed bed, treated at 40°C and 1MPa, the initial discharge contains 15ppm of aldehydes and ketones, and 362ppm of acetals and ketals. It is required that the output index of aldehydes and ketones impurities is less than or equal to 20ppm, and the operating time of the device is 900h.

[0032]The above-mentioned catalyst to be treated is first purged with nitrogen at 300-4...

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Abstract

The invention provides a method for removing aldehyde and ketone in a HPPO process recycling methanol by using a molecular sieve catalytic reaction. A molecular sieve is modified by an ion exchange method, the recycling methanol containing the aldehyde and ketone impurities from the HPPO process is pumped at a certain airspeed in a fixed bed reactor with a modified molecular sieve, the modified molecular sieves catalyze the reaction of the aldehyde and ketone with the methanol at a certain temperature and pressure to form corresponding acetals and ketals, and the purified recycling methanol for removing the aldehyde and ketone impurities is obtained. The process for removing the aldehyde and ketone impurities is simple, and does not produce nitrogen-containing wastewater, and the modifiedmolecular sieve catalyst can be regenerated by simple high-temperature baking.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and more specifically relates to a method for removing aldehydes and ketones in an HPPO process by catalytic reaction of molecular sieves, and mainly processes circulating methanol containing 50-5000 ppm of aldehydes and ketones impurities. Background technique [0002] Propylene oxide (PO) is the second largest propylene derivative after polypropylene. It is an important bulk organic chemical raw material and ranks among the 50 chemicals with the largest output in the world. Propylene oxide is mainly used to produce polyether polyols, and then to manufacture polyurethanes, which are used in coatings, automobiles, construction, home appliances, transportation and other fields. The main production methods of propylene oxide are chlorohydrin method, co-oxidation method and direct oxidation method (HPPO) method. Chlorohydrin process equipment has serious corrosion and high energy con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D301/32C07D303/04B01J29/08B01J29/70B01J29/40B01J37/30
CPCB01J29/084B01J29/40B01J29/7003B01J29/7007B01J29/7038B01J37/30C07D301/32C07D303/04Y02P20/52Y02P20/584
Inventor 王根林丁克鸿徐林王铖马春辉刘相李殷恒志刘鑫
Owner JIANGSU YANGNONG CHEM GROUP
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