Location: Fujian Province, China

Start-up time: Jan., 2014

Background:

Original capacity of hydrocracking unit was 2.35Mt/a, which fractionator ID was 5400mm. The purpose of this revamping was increasing capacity to be 2.5Mt/a, and to add one more side product, i.e. kerosene product. Customer wanted to improve separation efficiency by replacing old internals without changing vessel.

Solution:

(1) For adding one more draw-off for kerosene, the process was simulated to confirm the optimum location of side products;

(2) Old trays was replaced by ADV® trays with recycling original welding parts;

(3) The location of mid-pumparound was moved down in order to have a negative overlap between two products.

(4) To resolve problem of insufficient of NTS, trays at washing zone were replaced by Sepak® structured packing, and inlet distributor was used at the feed inlet section for better distribution to improve mass transfer efficiency.

Result:

Commissioning of this unit was at the beginning of 2014 and Performance evaluation was completed in May, 2014. Capacity could be 2.5Mt/a. All products were able to meet the requirements and had a negative overlap among them.