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Posts tagged “Changing World Technologies”

By Robert Rapier on Mar 13, 2009 with 6 responses

Update on CWT IPO

A couple of months ago, in response to a story that Changing World Technologies was going to file an IPO to help commercialize their TPD technology, I reposted my story: TDP: The Next Big Thing Turns out they decided against the IPO. Bankruptcy seemed the better option: Renewable Environmental Solutions owner closes plant in Missouri, files for bankruptcy Changing World Technologies Inc., based in West Hempstead, N.Y., filed for Chapter 11 protection Wednesday in the U.S. Bankruptcy Court for the Southern District of New York. In a news release, the company, which owns the Renewable Environmental Solutions plant in Carthage, said it was trying to reorganize its business and find new financing “to fund its operations going forward and to… Continue»

By Robert Rapier on Feb 3, 2009 with no responses

TDP Chemistry

While the most recent two posts (here and here) on Changing World Technologies’ thermal depolymerization (TDP) process were reposts, this one has not been previously posted here. Regular reader “Optimist” was initially optimistic about the TDP technology. During his investigation, he went through the chemistry of the process, and came away feeling a bit short-changed. ——————- Perhaps the confusion about reasonable yields from TDP can be addressed by looking at the chemistry, as proposed by Dr. Adams at (RR: now hosted at) As I see it, the conversion can be presented as three chemical reactions: hydrolysis, decarboxylation, and product degradation (for lack of a better term). 1. Hydrolysis (aka depolymerization) H2-C-O-R …….|..H-C-O-R + 3H2O => C3H8O3 (glycerol) +… Continue»

By Robert Rapier on Jan 31, 2009 with no responses

Repost of TDP: What Went Wrong

The is Part II of my look at Changing World Technologies’ thermal depolymerization process. This essay came from a reader, and was originally posted on April 12, 2007. But I also want to add some comments that regular reader “Optimist” added following the previous essay. First, those comments: The 85% efficiency claim is based on a faulty mass balance. The faulty mass balance is the basis for an equally faulty energy balance. You can verify by comparing production data (bbl oil/ton of waste) to the mass balance (still) presented by CWT. Contrary to what the breathless writers at Discover magazine believe, this technology is good only for recycling lipids (fats and oils) and the fat-soluble amino acids in protein. To… Continue»

By Robert Rapier on Jan 28, 2009 with 1 response

Repost of TDP: The Next Big Thing

Because of the upcoming IPO for Changing World Technologies (See this story at Seeking Alpha) the articles that I wrote on the company are getting quite a bit of traffic. I thought I would bump them to the top for a review of who they are, what they do, and where things went wrong for them. The following essay was originally published on April 9, 2007. If you want to immediately read the sequel to this post, it was TDP: What Went Wrong. That post was written by a reader, and is full of slides and some very keen insight. I will bump it up to the top in a couple of days. ————————– If you are a layperson, it… Continue»

By Robert Rapier on Apr 12, 2007 with no responses

TDP: What Went Wrong

I am still working on an essay on butanol, pentanol, and higher-chain alcohols, but it has been really difficult to find the information I am looking for. (But I have figured out why bio-butanol has not taken off). Regardless, I hope to complete it in a few days. In the interim, in response to my TDP essay, I received a comprehensive e-mail from a reader who provided some very specific details on what went wrong. He included a presentation in which he referred to several slides, and I will pull those out and post them so the references are clear. I will also insert some comments in the text [like this]. ————————————— Robert, I enjoy your blog quite a lot…. Continue»

By Robert Rapier on Apr 9, 2007 with 2 responses

TDP: The Next Big Thing

If you are a layperson, it may not be clear to you just how much of the current infatuation with cellulosic ethanol is hype, and how much is based on realistic assessments. So, I thought I would take you down memory lane and revisit another technology that was going to reduce our dependence on foreign oil. The Hype: TDP Will Save the WorldIn May of 2003, Discover Magazine published Anything Into Oil. It was a look at a technology called thermal depolymerization (TDP), which could take any organic material and turn it into oil. This was a high profile write-up with a lot of hype, and the technology of Brian Appel and his company Changing World Technologies (CWT) was really… Continue»