Slurry or liquid catalyst feeding device
A liquid catalyst and feeding device technology, applied in feeding devices, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of uneven dispersion of slurry liquid catalyst, affecting the stability of polymerization reaction, concentration changes, etc.
Active Publication Date: 2007-03-14
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
However, the sealing performance of the feeder is poor, because the catalyst enters the feeding port by gravity sedimentation, and the dispersion of the slurry liquid catalyst is uneven, which affects the reaction speed; at the same time, the catalyst enters the reactor in a non-atomized state, which is easy to cause reaction agglomeration
Another example is the slurry or liquid catalyst feeding device provided in Chinese patent 02269754, which mainly includes a catalyst feeding tank, a micro-feeder connected thereto, a hydraulic oil control system, and an atomizing nozzle. Although the feeding system can realize slurry or liquid catalyst Stable and continuous feeding, but there are also problems such as the catalyst is easy to settle in the delivery pipeline and the concentration changes, so it affects the accuracy of feeding, which in turn affects the stability of the polymerization reaction
Method used
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Embodiment 1
[0028] As shown in Figure 1, the catalyst feeding tank is a 5 liter sealed steel pressure vessel, equipped with a three-blade oblique paddle stirrer. The stirring speed is controlled at 150 rpm. The inside of the catalyst tank is a nitrogen positive pressure atmosphere of 0.2-0.3 MPa. The concentration of the catalyst prepared is dry powder catalyst: 104 grams, hexane: 4 liters, and the concentration of the prepared slurry is 25.5 g / L.
[0029] The bottom of the catalyst tank is discharged to the delivery pump, and the delivery pump transports the slurry catalyst to the c port of the six-way valve. After flowing out from the b port, it enters the e port through a section of 2ml quantitative tube, then flows out from the f port, and passes through a The pipeline sees the cup and flows back to the catalyst tank. The transfer pump is a small flow centrifugal pump with a flow rate of 200L / hr.
[0030] Port f of the six-way valve is connected to 2.5MPa high-pressure nitrogen, an...
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The invention relates to a slurry or liquid catalyst feeder, which comprises slurry or liquid catalyst pot, transmission pump, at least one six-way valve and quantitative tube. Wherein, the transmission pump via tube is connected to the catalyst pot and the six-way valve, to transmit the slurry or liquid catalyst to the quantitative tube between two connectors of six-way valve, then via the six-way valve to be circulated to the catalyst pot; when feeding material, the six-way valve operates one time, and the catalyst slurry or liquid of quantitative tube will be fed to the polymerization reaction system via the inertia gas at another connector of six-way valve. Said invention can be used in olefin polymerization reaction, with linear adjustment and wide adjust range.
Description
[0001] The invention relates to a slurry or liquid catalyst feeding device, which can be widely used in olefin polymerization reaction process. technical background [0002] As we all know, most of the catalysts currently used in olefin polymerization in industry are solid particle type. There are usually two ways to feed solid catalysts. One is to directly add a set of specially designed complex catalyst feeding devices, such as in the Unipol polyethylene process. The solid catalyst feeding device used on the device; the second is to prepare the catalyst into a certain concentration of slurry or paste through a complicated process, and then send it into the polymerization reactor with a complicated metering and feeding system. In the above two methods, the equipment investment of the former is very high, and there is no accurate and effective method to know the catalyst stock in the feeder. The latter operation process is extremely complicated, and the preparation of a single...
Claims
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Inventor 宋文波王洪涛王路生杨芝超马青山刘金伟
Owner CHINA PETROLEUM & CHEM CORP