A kind of dry roasting and recovery method of SiAlP molecular sieve fine powder
A silicon aluminum phosphorus molecular sieve, drying and roasting technology, applied in the direction of molecular sieve and alkali exchange phosphate, molecular sieve characteristic silicon aluminum phosphate, etc., can solve the problems of molecular sieve value waste, exhaust gas cannot be processed, time-consuming and labor-intensive efficiency, etc., to achieve Increase recovery rate and economy, save research and development time and energy, and improve experimental efficiency
Active Publication Date: 2019-02-22
CHINA TIANCHEN ENG +1
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Problems solved by technology
[0004] At present, the drying and roasting technology of silicon aluminum phosphorus molecular sieve is mainly carried out by electric furnace. This drying and roasting method is time-consuming, labor-intensive and inefficient. consumes a lot
At the same time, molecular sieves will produce amines, nitrogen oxides, carbon dioxide and other substances during drying and roasting, which may easily cause explosion hazards under the airtight condition of the electric furnace. At the same time, the waste gas generated during drying and roasting cannot be processed, resulting in a bottleneck for the entire process.
Later, after investigation and experimentation, a rotary kiln was used to dry and roast the silicon-aluminum-phosphorus molecular sieve. However, due to the unique properties of the silicon-aluminum-phosphorus molecular sieve, during the use of the rotary kiln, the blocky molecular sieve will condense into hard spherical particles with different particle sizes. , and the dry-roasted molecular sieve used in the follow-up process is fine powder, and the hard spherical particles after drying and roasting have to be crushed again, which increases the labor load and reduces the work efficiency
At the same time, during the drying and roasting process, the fine powder mixed in the compressed air and brought out of the kiln body causes a waste of the value of the molecular sieve and reduces the economical efficiency of the molecular sieve.
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[0024] Unless otherwise defined, the technical terms used in the following embodiments have the same meaning as commonly understood by those skilled in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are conventional biochemical reagents; the experimental methods, unless otherwise specified, are conventional methods.
[0025] The present invention will be described in detail below in conjunction with examples.
[0026] Add 200Kg of silicon-aluminum-phosphorous molecular sieve to be dried and roasted after the plate-and-frame filtration or centrifugal filtration process into the rotary kiln, and add 15Kg of zirconia balls (diameter 12mm) at the same time, and set the kiln speed at the same time under the condition of program temperature control The pressure in the kiln is controlled at 2.4KPa for drying and roasting at 1r / min. When the kiln body rotates, the zirconia balls collide with the molecular s...
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Abstract
The invention provides a method for drying roasting and recovery of silicon-aluminum-phosphorus molecular sieve fine powder, which comprises the steps: feeding a silicon-aluminum-phosphorus molecular sieve to be subjected to drying roasting and filling balls into a kiln body of a rotary kiln, carrying out drying roasting under program temperature control, and finally carrying out air cooling to room temperature by using compressed air; enabling the filling balls to collide with the silicon-aluminum-phosphorus molecular sieve for crushing when the kiln body rotates, and discharging the crushed silicon-aluminum-phosphorus molecular sieve fine powder; meanwhile, and the compressed air introduced into the kiln body passes through the kiln body and enters a fine powder recovery device. Most of the fine powder is descended by gravity to a collection tank for recovery, and the compressed air passes through sieve holes of the fine powder recovery device and enters into absorption liquid for purification. By reasonable design, the follow-up treating process is saved; in combination with the reasonable technique, the method is time saving and labor saving, and a working procedure for crushing of hard spherical particles into fine powder is omitted.
Description
technical field [0001] The invention belongs to the technical field of molecular sieve preparation, and in particular relates to a method for drying, roasting and recovering silicon-aluminum-phosphorus molecular sieve fine powder. Background technique [0002] Propylene is currently the most important bulk chemical product in the world and one of the basic chemical raw materials supporting my country's economic development. It can be used to prepare a variety of basic organic raw materials. For example, propylene oxide, acrolein, propenyl alcohol, isopropanol, carbon tetrachloride, butanol and the like can be prepared. In recent years, due to the demand for downstream derivatives (especially polypropylene), the demand for propylene has increased significantly. Due to the shortage of domestic propylene resources, it is far from meeting the needs of the domestic market, and the domestic self-sufficiency rate has dropped sharply, requiring a large amount of imports. With the ...
Claims
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IPC IPC(8): C01B39/54C01B37/08
CPCC01B37/08C01B39/54
Inventor李欢王海国王聪刘新伟石华陈晨刘俊生左宜赞
OwnerCHINA TIANCHEN ENG