The storage temperature of butadiene should not exceed 27 degrees.
When storing butadiene, the storage temperature of the storage tank must be strictly controlled. In principle, the storage temperature of butadiene products should not be higher than 27°C. Overpressure alarm and pressure relief discharge systems should be installed in spring irrigation. To ensure that the tank is not overpressured, each tank should be equipped with a safety valve. According to the physical properties of C4 liquid hydrocarbons, the storage tank pressure should be controlled as low as possible, with a maximum of no more than 0.5MPA, to reduce the formation of polymers.
Strictly control the oxygen content in the storage system to not exceed 1MG/G. In all aspects of storage and transportation, control the penetration of oxygen. Regular testing should be carried out as required. When the gas phase oxygen content in the storage tank exceeds 1MG/G, measures should be taken to reduce the oxygen content in the gas phase space.
Storage of butadiene materials should be regularly cooked to remove peroxide, in principle once a year. Select appropriate chemical reagents, such as ferrous sulfate, sodium nitrite, etc., cooking temperature and time according to requirements. Deoxygenated water is suitable for cooking. After cooking, manual cleaning must be carried out using explosion-proof tools to completely remove the remaining polymer in the tank.
Requirements for butadiene storage tanks
1. The storage tank must be equipped with a well-maintained electrostatic grounding device to prevent the accumulation of static electricity and tip discharge, ensure timely discharge of static electricity, and conduct regular inspections. The first outlet flange of the storage tank is subject to explosion detection, and the safety of the equipment's electrostatic grounding facilities and safety accessories are inspected in accordance with regulations. In irrigation areas where butadiene is stored, a certain number of combustible gas alarms must be installed as required, and inspections must be carried out regularly to ensure that the combustible gas alarms are in good condition. It is best to set up a complete monitoring system.
2. Before the butadiene storage tank is taken out of service for maintenance, the system should be processed according to the requirements to ensure the safety of the disassembly and inspection process. During system maintenance, polymers should be completely removed. Cleaning operations must use explosion-proof tools and ensure to be carried out in wet conditions. Hazardous materials that have been cleaned up should be handled with care, placed in a container to moisten them, and then sent to a safe location for proper disposal.
3. After the tank maintenance is completed, the stored materials must be replaced with high-purity nitrogen (purity is not less than 99.9), and the oxygen content in the system is strictly controlled to be less than 1MG/G. Butadiene storage tanks must be dehydrated in accordance with regulations, and the accumulated water in the storage tanks must be removed in a timely manner. When designing the dehydration device, two storage tank dehydration valves must be installed. The first valve should be installed near the root of the storage tank, and the second valve should be installed at the lower part of the dehydration pipeline. Under normal circumstances, the first valve should be open and the second valve should be closed.