【Daily Question】What medium is used for purging when the polypropylene plant starts up in 20160704?

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To boost popularity and enhance technical exchanges among sea enthusiasts, we are starting to publish 【Question of the Day】 from today. Participation earns 4 points of wealth! 10 wealth points as a reward for correct answers or in-depth discussions! :Lol Question: What medium is used to purge the propylene system when the propylene plant is started up? Answer: Nitrogen or air ===================== Promotion of petrochemical-related activities: ☛ Notice on the launch of the large-scale event “I’m saving energy; where are you?” in the petrochemical area: http://bbs.hcbbs.com/thread-1579199-1-1.html (Source: Haichuan Chemical Industry Forum). This event offers awards in both written and photographic categories. When there are over 200 entries, an additional grand prize will be awarded, worth 600 Haichuan coins; if there are more than 300 entries, the grand prize value increases to 1,000 Haichuan coins, and if there are 500 entries, it rises to 1,500 Haichuan coins. First prize: 3 Haichuan commemorative water cups. Second prize: 5 winners, each receiving 120 Haichuan coins. Honorable mentions: several winners, each receiving 200 wealth points. --------------------------------------------------------------- ☛ “My facility, my home” – Photo competition (10 wealth points per photo): http://bbs.hcbbs.com/thread-1495069-1-1.html (Source: Haichuan Chemical Industry Forum). --------------------------------------------------------------- ☛ Haichuan Freelancers’ large-scale “public welfare” event is now underway! http://bbs.hcbbs.com/thread-1576975-1-1.html (Source: Haichuan Chemical Industry Forum)