Delayed coking process
OwnerNai Y. Chen, Dennis E. Walshinventors
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Abstract
A delayed coking process in which part of the coke produced is heated by partial burning and mixed with preheated coker feedstock to raise the temperature of the coking mass present in the coking drums. The rapid heat transfer thus obtained brings about some immediate flashing of volatiles and makes possible higher than usual temperatures in the coking drums. The results are a reduction of residence time in the drums and an increase in the yield of volatile products. Hot coke in excess of that required to heat the feed may be gasified. Thus, resultant net coke yields are lower than the conventional delayed coking process.
Claims9
In a process for producing delayed petroleum coke comprising heating a normally liquid hydrocarbon coker feedstock in a heating means to a temperature within the range from about 850.degree. to 950.degree. F., charging the resulting heated coker feedstock to a delayed coking drum and maintaining it therein at delayed coking conditions until petroleum coke is formed, and periodically recovering a petroleum coke product from the coke drum;
- the improvement wherein coke particles at a temperature within the range from about 1150.degree. to 1750.degree. F. are added to the heated coker feedstock to raise the temperature of the resultant mixture by at least 50.degree. F. above the temperature of the heated coker feedstock, the weight ratio of coke particles to heated coker feedstock being in the range from about 0.1 to 2.0.
Dependencies are inferred from the claim text.