Desalination method and device in petroleum sulfonate production

Abstract

The invention relates to a method and a device for precipitating salt from salt-containing waste water in sulfonate production, and provides a desalination method and a device with low energy consumption and simple process. Ammonia is dissolved in cooled salt-containing waste water for salt crystallization and precipitation; the salt-containing waste water after salt separation is recycled for cooling and ammonia dissolution; and thus salts are precipitated and separated continuously which allows the waste water to reach the desalination requirements. The device comprises a cooler, a crystallizer, a cyclone separator, and buffer tank; the cooler is provided with a refrigerant fluid outlet, a refrigerant fluid inlet, and an exhaust port at the top; the cooler is connected with the crystallizer through a communicating vessel; a transfer pump and a flash evaporation tank are disposed between the crystallizer and the cyclone separator; the cyclone separator is connected with the buffer tank; the cyclone separator is provided with a solid material outlet. With the above technical scheme, the desalination speed is high, and the efficiency is high. The operation is simple; the automation degree is high; the device maintenance is convenient; and the labor intensity is low. Ammonia in waste water after production can be recovered and recycled, which saves production cost.

Description

technical field [0001] The invention relates to a method and a device for precipitating salt from saline wastewater in sulfonate production. In particular, a desalination method and device for wastewater in petroleum sulfonate production. Background technique [0002] Petroleum sulfonate is an anionic surfactant obtained by sulfonation and neutralization of petroleum distillate oil as raw material. In order to improve the sulfonation conversion rate of raw material oil, it is generally necessary to add an excessive amount of sulfonating agent, so that the neutralized wastewater generally contains A large number of inorganic salt ingredients. Due to the existence of a large amount of inorganic salts, the wastewater cannot be recycled, and direct discharge will not only cause waste of resources but also bring serious environmental pollution problems. For wastewater desalination methods, there are also reports in China, such as CN1074886A provides a method for recycling high-...

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Problems solved by technology

Due to the existence of a large amount of inorganic salts, the wastewater cannot be recycled, and direct discharge will not only cause waste of resources but also cause serious environmental pollution problems

For wastewater desalination methods, there are also reports in China. For example, CN1074886A provides a method for recycling high-concentration salt wastewater, which realizes the recycling of wastewater through evaporation, crystallization and infrared treatment. However, the energy consumption is large, the processing capacity is small, and the cost is high. , it is difficult to achieve continuous operation

CN101891269A reports the method of freezing desalination, which needs to be frozen at 0~-25°C for 3~10 hours to obtain brine and ice phase, then separate the brine and ice phase, and melt the ice phase to obtain desalted wastewater. Therefore, the operation process is extremely complicated And the salt cannot be removed, and it takes a long time and the processing capacity is low

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