【Q&A Question 081】March 22, 2017
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This post was last edited by 955559 on 2017-7-21 at 22:30. [Q&A Question No. 081] Please list the precautions for the hot oil circulation in hydrogenation units as of 2017.03.22. The reference answers will be visible after responding; points are awarded by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) 1. When raising the temperature through hot oil circulation, air cooling should be activated first. 2. If pumping vacuum is detected during the temperature-raising process, the heating should be stopped immediately. 3. The pre-heating line of the hot oil pump should be put into use during cold oil circulation, and another pump should be used for operation. 4. When introducing oil and establishing oil circulation, precautions must be taken to prevent leaks, spills, and other such incidents. 2017 Q&A Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html Third Phase of Haimen HaiChuan Outstanding Management Members Selection Contest http://bbs.hcbbs.com/thread-1655902-1-1.html (Source: Haimen HaiChuan Chemical Forum)
The purpose of circulating hot oil in the distillation system is to check the operational condition of the equipment under hot conditions, in order to prepare for receiving the oil produced by the reaction. When the distillation system is heated to around 100°C, attention should be paid to draining water from the system to prevent the pump from running dry. Thermal tightening should be carried out when the temperature rises to around 250°C.
Prevent running, leaking, dripping, seepage, and cross-contamination
1. When raising the temperature through hot oil circulation, air cooling should be activated first； 2. If pumping out occurs during the heating process, heating should be stopped immediately ； 3. The preheating line of the hot oil pump is activated during cold oil circulation, and the operating pump must be switched to use it ； 4. When introducing hot oil and establishing an oil circulation system, it is necessary to prevent accidents such as leaks, spills, drips, and seepages.
1. When raising the temperature through hot oil circulation, air cooling should be turned on first； 2. If pumping out occurs during the heating process, heating should be stopped immediately ； 3. The preheating line of the hot oil pump should be activated during cold oil circulation, and the operating pump should be switched for use ； 4. When introducing oil and establishing an oil circulation system, it is necessary to prevent accidents such as leaks, spills, drips, and seepages.
The purpose of circulating hot oil in the distillation system is to check the operational condition of the equipment under hot conditions, in order to prepare for receiving the oil produced by the reaction. When the distillation system is heated to around 100°C, attention should be paid to draining water from the system to prevent the pump from running dry. Thermal tightening should be carried out when the temperature rises to around 250°C.
(1) Assess the actual maximum operating temperature of the product. (2) Examine the product’s evaporation properties and safety aspects, ensuring that its flash point meets the standard requirements. (3) Evaluate the degree of refinement of the product: it should be a light yellow transparent liquid with good storage stability, showing no color change or precipitation upon exposure to light. (4) Assess the product’s flowability at low temperatures; select an appropriate low-temperature performance based on the user’s location and the ambient temperature of the equipment
1. When raising the temperature through hot oil circulation, air cooling should be activated first. 2. If pumping vacuum is detected during the temperature-raising process, the heating should be stopped immediately. 3. The pre-heating line of the hot oil pump should be put into use during cold oil circulation, and the operating pump should be switched over. 4. When introducing oil and establishing oil circulation, measures must be taken to prevent leaks, spills, and other such incidents.
1. During hot oil transportation, carry out proper thermal tightening to prevent leaks and fires. 2. Pay attention to cutting water. 3. Prevent the pump from running dry. 4. Prevent excessive temperatures.
When raising the temperature, pay attention to tightening the flanges thermally, dehydrating the distillation system, and stabilizing the liquid levels in each container