Tervahl T Process Overview

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What is the purpose of the coil heater in the Tervahl T process?

To heat the feedstock to the desired temperature (correct)

To separate the products into desired streams

To convert the feedstock into synthetic crude

To cool down the gas produced from the process

What is the primary role of the soaking drum in both the Tervahl T and Tervahl H processes?

To hold the heated feedstock for a specified residence time (correct)

To produce synthetic crude

To separate the liquids from the hot separator

To generate fuel gas

What happens to the gas and oil mixture from the soaking drum effluent in the Tervahl H process?

Mixed with recycle hydrogen and separated in a hot separator (correct)

Converted into synthetic crude directly

Heated using a coil heater

Passed through a stabilizer section

In the Tervahl H process, what happens to the liquids from the hot and cold separator?

Sent to the stabilizer section for separation of purge gas and synthetic crude Signup and view all the answers

What is done to the gas produced from the Tervahl T process?

Used as fuel Signup and view all the answers

What temperature range characterizes vapor-phase cracking?

>500ºC to <50 psi Signup and view all the answers

What is the purpose of the distillate heater in the thermal distillate cracking process?

To achieve cracking under high temperature and pressure conditions Signup and view all the answers

Where is the heavy gas oil fraction taken from the combi tower typically routed to?

Surge drum Signup and view all the answers

What happens to the vacuum-flashed residuum from the vacuum flasher in the thermal distillate cracking process?

Used as refinery fuel Signup and view all the answers

What does routing heavy gas oil from both the vacuum flasher and combi tower to the distillate heater achieve in the thermal distillate cracking process?

Complete conversion of heavy gas oil Signup and view all the answers

What is a possible alternative use for light gas oil from the combi tower in the thermal distillate cracking process?

Used as a cutter stock Signup and view all the answers

How does the flexibility of feedstock and product requirements impact the thermal distillate cracking process?

By allowing optimization of conversion through adjustments of heavy gas oil recycling Signup and view all the answers

What is the main purpose of selective cracking in the context of thermal distillate cracking?

To prevent fouling caused by stable low-boiling materials Signup and view all the answers

What role does heavy gas oil play in the Shell thermal distillate cracking process?

It is converted to light gas oil mostly Signup and view all the answers

Why does selective process selectively convert stable low-boiling materials?

To prevent fouling and reduce undesired byproducts Signup and view all the answers

What is the primary benefit of converting heavy gas oil to light gas oil in thermal distillate cracking?

Minimization of coke formation Signup and view all the answers

How does stable low-boiling material affect efficiency in a thermal distillate cracking system?

Reduces efficiency by leading to fouling and undesired byproducts Signup and view all the answers

What distinguishes Shell thermal distillate cracking from other processes?

Converting high-boiling feedstocks to lower-boiling products Signup and view all the answers