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Heat pump rectification dividing wall tower device for separating ultrapure trichlorosilane and operation method

An ultra-pure trichlorosilane, heat pump rectification technology, applied in the field of new energy-saving separation devices, heat pump rectification dividing wall tower equipment and devices, can solve the problems of reducing energy consumption in the separation process, low investment costs, small footprint, etc. Reach the effect of reducing equipment investment cost and reducing quantity

Active Publication Date: 2012-08-01
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aiming at the problems of large energy consumption and large number of separation towers in the separation of trichlorosilane at present, it is proposed to use heat pump rectification dividing wall tower as the equipment for purifying trichlorosilane, combined with the properties of trichlorosilane raw materials, to formulate a reasonable Process parameters, including theoretical plate number, reflux ratio, tower top pressure, tower top liquid distribution ratio (the ratio of liquid reflux in the feed section to the total top reflux flow) and tower bottom gas distribution ratio (feed section gas The ratio of the rising volume to the total rising gas volume of the tower kettle), etc., can obtain high-purity trichlorosilane products, and reduce the energy consumption of the separation process. It has the advantages of small footprint, low investment cost, and strong operability.
[0004] At present, researchers at Tianjin University have developed a variety of equipment and processes for the separation of trichlorosilane, which are reflected in patents CN101249312A, CN101538044A, CN101704524A, CN102153092A and CN101786630A, but they are all multi-tower processes. There is no application example of heat pump rectification dividing wall column device

Method used

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  • Heat pump rectification dividing wall tower device for separating ultrapure trichlorosilane and operation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: Taking the raw material containing dichlorodihydrosilane, trichlorosilane and silicon tetrachloride as an example, the saturated liquid enters the partition tower with a flow rate of 10000kg / hr, and the system composition (dichlorodihydrosilane 10% , trichlorosilane 80% and silicon tetrachloride 10%). The number of theoretical plates in the main tower of the partition tower is 210, the number of theoretical plates in the pre-separation tower is 300, the feed position is the 85th theoretical plate of the pre-separation tower, the reflux ratio is 14.5, and the side line extraction position is in the 72nd block of the main tower Theoretical plate, the pressure at the top of the tower is 100kpa, the liquid distribution ratio at the top of the tower is 28.9%, and the gas distribution ratio at the bottom of the tower is 51.9%. The purity of the obtained trichlorosilane stream is 99.999943%, the yield reaches 91.25%, the energy consumption of the compressor is 50...

Embodiment 2

[0019] Embodiment 2: Taking the raw material containing dichlorodihydrosilane, trichlorosilane and silicon tetrachloride as an example, the saturated liquid enters the partition tower with a flow rate of 10000kg / hr, and the system composition (dichlorodihydrosilane 10% , trichlorosilane 80% and silicon tetrachloride 10%). The number of theoretical plates in the main tower of the partition tower is 160, the number of theoretical plates in the pre-separation tower is 200, the feed position is the 70th theoretical plate of the pre-separation tower, the reflux ratio is 14, and the side line extraction position is in the 68th block of the main tower Theoretical plate, the pressure at the top of the tower is 280kpa, the liquid distribution ratio at the top of the tower is 39.4%, and the gas distribution ratio at the bottom of the tower is 43.5%. The purity of the obtained trichlorosilane stream is 99.999171%, the yield reaches 90.62%, the energy consumption of the compressor is 331....

Embodiment 3

[0020]Embodiment 3: Taking the raw material containing dichlorodihydrosilane, trichlorosilane and silicon tetrachloride as an example, the saturated liquid enters the partition tower with a flow rate of 10000kg / hr, and the system composition (dichlorodihydrosilane 10% , trichlorosilane 80% and silicon tetrachloride 10%). The number of theoretical plates in the main tower of the partition tower is 150, the number of theoretical plates in the pre-separation tower is 180, the feed position is the 70th theoretical plate of the pre-separation tower, the reflux ratio is 12.5, and the side line extraction position is in the 70th theoretical plate of the main tower Theoretical plate, the pressure at the top of the tower is 300kpa, the liquid distribution ratio at the top of the tower is 35.4%, and the gas distribution ratio at the bottom of the tower is 41.4%. The purity of the obtained trichlorosilane stream is 99.999334%, the yield reaches 89.99%, the energy consumption of the compr...

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Abstract

The invention relates to a heat pump rectification dividing wall tower device for separating ultrapure trichlorosilane and an operation method. In order to obtain high-purity trichlorosilane, light and weight impurities in raw materials are removed through the separation of a plurality of towers usually, and a lot of energy is consumed. By adopting the heat pump rectification dividing wall tower device, various light and weight impurities can be removed completely in one dividing wall tower so as to obtain ultrapure trichlorosilane, and the purpose of reducing energy consumption can be achieved through a heat pump. The tower is divided into a feeding section, a tower top section, a tower bottom section and a siding product section through a partition board in the dividing wall tower; and ultra-high purity trichlorosilane products can be obtained in a proper position of the siding product section under proper controlling parameters. The heat pump rectification dividing wall tower device has the advantages of integrating the characteristics of heat pump rectification and the dividing wall tower, removing different impurities in one tower, greatly reducing energy consumption at the same time when obtaining the ultrapure trichlorosilane products, and reducing the equipment investment.

Description

technical field [0001] The invention belongs to the technical field of rectification, and relates to a novel energy-saving separation device for the purification of ultra-pure trichlorosilane, in particular to an equipment device and an operation method for a heat pump rectification dividing wall tower for separating ultra-pure trichlorosilane. Background technique [0002] As a clean and environmentally friendly renewable energy source, solar energy is considered to be an important alternative energy source in the future. At present, the direct use of solar energy is mainly solar power generation, and its core device is solar cells. The main material for making solar cells is polysilicon. With the rise of the photovoltaic industry in recent years, the demand for polysilicon continues to grow. In view of the fact that my country has become the world's second largest oil importer, traditional energy sources are under great pressure, which further promotes the accelerated de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/107
CPCY02P20/129
Inventor 刘春江郭凯袁希钢丁晖殿
Owner TIANJIN UNIV