PTD 101

Welcome to “Pass-through Distillation 101″, a half-hour course comprising six videos that explain the basics of the topic.
View each lecture in sequence by clicking on it; that will invoke a short YouTube video.

Lecture 1: Defining the Term

Lecture 2: Temperatures and Pressures

Lecture 3: Multiple Effect Distillation

Lecture 4: A Working Example

Lecture 5: SAM A Special Device

Lecture 6: Heat Pipes


Question 1:
Pass-through distillation is a short-hand way of saying
a) A process enhanced by mechanical vapour re-compression
b) An evaporator connected to a gas absorption unit
c) Any two step distillation process

Question 2:
Liquids can be caused to boil at low temperatures through
a) Photon interference
b) Exergy destruction
c) Low absolute pressure

Question 3:
PTD involves a multiple effect distillation train. The fluid fed to it is
a) Absorbent fluid from the gas absorber
b) The liquid feed to the process
c) cooling water

Question 4:
The front end evaporator in PTD gets its heat from
a) plant steam
b) heat rejected by the absorber
c) electrical resistance heaters

Question 5:
If a single effect distillation is replaced by PTD with a 3 effect desorber, energy savings should be on the order of
a) 20%
b) 50%
c) 75%

Question 6:
An existing commercial device using a form of PTD is
a) a microwave oven
b) an absorption chiller
c) a coffee percolator

Question 7:
The above device becomes a PTD still when changed from
a) a closed system to an open system
b) a hot system to a cool one
c) a low pressure system to a high pressure system

Question 8:
A stripper/absorber module (SAM) simplifies a PTD apparatus by
a) using a modified condenser
b) combining evaporator and absorber in a single shell
c) the use of advanced fluid dynamics

Question 9:  Warning! Draw yourself a sketch before answering!
PTD requires a vacuum pump to carry away gases that that were originally dissolved in the process feed.
The inlet of the vacuum pump connects to a port near
a) the inlet of the evaporator compartment
b) the liquid inlet of the absorber compartment
c) the liquid outlet of the absorber compartment

Question 10:
A SAM can be made elegantly simple in construction through the use of
a) Copper tubing
b) heat pipes
c) teflon spacers


2 thoughts on “PTD 101

  1. Very impressive Professor Ian. You have taken your education and marketing to a new level with your Linked-In network and video presentations.

    However, we need to drive more traffic to your new website and professional YouTube videos. Accelerating the rate of technology transfer is the key to success.

    Without studying for the exam which I wasn’t aware of before viewing this website and viewing your YouTube channel, I am going to wing it and give you my answers:


    So I am curious, anyone contact you about using the PTD and SAM for a “Continuous Stirred pH-redox Auxostat and Ethanol Stripping Integrated with Wet Fractionation, Separate Hydrolysis, Enzyme-Cell Biomass Recycling & Closed Loop Biosystems Architecture” like we discussed and developed the concept for several years ago?

    I have to admit, watching your videos and seeing how you have progressed in your PTD and SAM technology made me look back at what we discussed as contained in my compilation on the above concept. It would be nice to see it come to fruition one of these days.

    We need to generate some sales and get a deep pockets investor on board to speed things along!

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