Equipment and method for purifying bioethanol
A technology of bioethanol and extraction method, which is applied in the chemical industry, can solve the problems of unutilized heat, unoptimized system, and large amount of fresh steam, and achieve the effects of reducing the amount of public works, significant economic effects, and saving operating costs
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Embodiment 1
[0031] Adopt equipment and technique of the present invention, concrete flow process is as figure 1 shown.
[0032] The pre-separation tower (1) is a plate tower with 15 theoretical plates, and the mixture (101) of ethanol and water is fed from the 10th theoretical plate of the pre-separation tower (1), and the operating pressure is 5.05×10 4 Pa, the temperature at the top of the tower is 60°C, the temperature at the bottom of the tower is 82°C, the steam at the top of the tower (102) enters the first compressor (4) to pressurize and heat up, the compression ratio is 2, and enters the first stage of the pre-separation tower (1) tower kettle. The heat exchanger (8) enters the flash tank (9) after heat exchange, and the gaseous phase stream (103) after flashing enters the second compressor (5), and the compression ratio is 2, and the pre-separation tower (1) tower still adopts Water (109) with a mass fraction of 99.9% is produced, and the ethanol-water azeotrope (108) at the to...
Embodiment 2
[0041] The same as the process flow described in embodiment 1, the difference is that the pre-separation tower (1) is a packed tower, and the number of theoretical plates is 25, and the mixture (101) of ethanol and water is obtained from the 20th block of the pre-separation tower (1). Theoretical plate feed, operating pressure is 2.02×10 5 Pa, the temperature at the top of the tower is 95°C, the temperature at the bottom of the tower is 120°C, the compression ratio of the compressors (4, 5) is 4, and water (109) with a mass fraction of 99.95% is extracted from the bottom of the pre-separation tower (1). The azeotropic rectification tower (2) is a packed tower, and the number of theoretical plates is 30, and the ethanol-water azeotrope (108) is fed from the 25th theoretical plate of the azeotropic rectification tower (2), and the entrainer is selected from benzene , the operating pressure is 1.52×10 5 Pa, the temperature at the top of the tower is 82°C, the temperature at the ...
Embodiment 3
[0047] The same as the process flow described in embodiment 1, the difference is that the number of theoretical plates in the pre-separation tower (1) is 18, and the mixture (101) of ethanol and water is fed from the 14th theoretical plate of the pre-separation tower (1) , the operating pressure is 1.01×10 5 Pa, the temperature at the top of the tower is 78°C, the temperature at the bottom of the tower is 100°C, the compression ratio of the compressors (4, 5) is 3, and water (109) with a mass fraction of 99.91% is extracted from the bottom of the pre-separation tower (1). The azeotropic rectification tower (2) is a packed tower with 20 theoretical plates, and the ethanol-water azeotrope (108) is fed from the 15th theoretical plate of the azeotropic rectification tower (2), and the entrainer is selected from acetic acid Ethyl ester, the operating pressure is 8.08×10 4 Pa, the temperature at the top of the tower is 62°C, the temperature at the bottom of the tower is 71°C, the c...
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Abstract
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