Researchers list 'seven chemical separations to change the world'

Researchers list '7 chemical separations to change the world'
Thermally based industrial chemical separation processes such as distillation now account for 10 to 15 percent of the world's annual energy use. Researchers at the Georgia Institution of Technology are suggesting seven energy-intensive separation processes they believe should be the top targets for research into low-energy purification technologies. Shown are (l-r) David Sholl and Ryan Lively. Credit: Rob Felt, Georgia Tech

Thermally-based industrial chemical separation processes such as distillation now account for 10 to 15 percent of the world's annual energy use. Slaking the global thirst for energy could therefore get a substantial boost from improved technologies for producing fuels, plastics, food and other products with reduced inputs of energy.

In a comment article published April 26 in the journal Nature, two researchers from the Georgia Institute of Technology suggest seven -intensive separation processes they believe should be the top targets for research into low-energy purification technologies. Beyond cutting energy use, improved techniques for separating chemicals from mixtures would also reduce pollution, cut carbon dioxide emissions - and open up new ways to obtain critical resources the world needs.

Technologies applicable to those separation processes are at varying stages of development, the authors note. These alternative processes are now under-developed or expensive to scale up, and making them feasible for large-scale use could require a significant investment in research and development.

"We wanted to highlight how much of the world's energy is used for chemical separations and point to some areas where large advances could potentially be made by expanding research in these areas," said David Sholl, one of the article's authors and chair of Georgia Tech's School of Chemical & Biomolecular Engineering. "These processes are largely invisible to most people, but there are large potential rewards - to both energy and the environment - for developing improved separation processes in these areas."

In the United States, substituting non-thermal approaches for purifying chemicals could reduce energy costs by $4 billion per year in the petroleum, chemical and paper manufacturing sectors alone. There's also a potential for reducing by 100 million tons per year.

"Chemical separations account for about half of all U.S. industrial energy use," noted Ryan Lively, an assistant professor in Georgia Tech's School of Chemical & Biomolecular Engineering and the article's second author. "Developing alternatives that don't use heat could dramatically improve the efficiency of 80 percent of the separation processes that we now use."

Dubbed the "seven chemical separations to change the world," the list is not intended to be exhaustive, but includes:

  • Hydrocarbons from crude oil. Hydrocarbons from crude oil are the main ingredients for making fuels, plastics and polymers - keys to the world's consumer economy. Each day, the article notes, refineries around the world process around 90 million barrels of crude oil, mostly using atmospheric distillation processes that consume about 230 gigawatts of energy per year, the equivalent of the total 2014 energy consumption of the United Kingdom. Distillation involves heating the oil and then capturing different compounds as they evaporate at different boiling points. Finding alternatives is difficult because oil is complex chemically and must be maintained at high temperatures to keep the thick crude flowing.
  • Uranium from sea water. Nuclear power could provide additional electricity without boosting carbon emissions, but the world's uranium fuel reserves are limited. However, more than four billion tons of the element exist in ocean water. Separating uranium from ocean water is complicated by the presence of metals such as vanadium and cobalt that are captured along with uranium in existing technologies. Processes to obtain uranium from sea water have been demonstrated on small scales, but those would have to be scaled up before they can make a substantial contribution to the expansion of nuclear power.
  • Alkenes from alkanes. Production of certain plastics requires alkenes - hydrocarbons such as ethane and propene, whose total annual production exceeds 200 million tons. The separation of ethene from ethane, for instance, typically requires high-pressure cryogenic distillation at low temperatures. Hybrid separation techniques that use a combination of membranes and distillation could reduce energy use by a factor of two or three, but large volumes of membrane materials - up to one million square meters at a single chemical plant - could be required for scale-up.
  • Greenhouse gases from dilute emissions. Emission of carbon dioxide and hydrocarbons such as methane contribute to global climate change. Removing these compounds from dilute sources such as power plant emissions can be done using liquid amine materials, but removing the carbon dioxide from that material requires heat. Less costly methods for removing carbon dioxide are needed.
  • Rare earth metals from ores. Rare earth elements are used in magnets, catalysts and high-efficiency lighting. Though these materials are not really rare, obtaining them is difficult because they exist in trace quantities that must be separated from ores using complex mechanical and chemical processes.
  • Benzene derivatives from each other. Benzene and its derivatives are essential to production of many polymers, plastics, fibers, solvents and fuel additives. These molecules are now separated using distillation columns with combined annual energy usage of about 50 gigawatts. Advances in membranes or sorbents could significantly reduce this energy investment.
  • Trace contaminants from water. Desalination is already critical to meeting the need for fresh water in some parts of the world, but the process is both energy and capital intensive, regardless of whether membrane or distillation processes are used. Development of membranes that are both more productive and resistant to fouling could drive down the costs.

Sholl and Lively conclude the paper by suggesting four steps that could be taken by academic researchers and policymakers to help expand the use of non-thermal separation techniques:

  1. In research, consider realistic chemical mixtures and reflect real-world conditions,
  2. Evaluate the economics and sustainability of any separation technique,
  3. Consider the scale at which technology would have to be deployed for industry, and
  4. Further expose chemical engineers and chemists in training to separation techniques that do not require distillation.

Explore further

Metamaterial separation proposed for chemical, biomolecular uses

More information: David S. Sholl et al. Seven chemical separations to change the world, Nature (2016). DOI: 10.1038/532435a
Journal information: Nature

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Citation: Researchers list 'seven chemical separations to change the world' (2016, April 27) retrieved 15 September 2019 from
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Apr 27, 2016
This is not at all new. There were big efforts in this area in response to the oil shocks of the 70's, and we revisited several of these as part of "Vision 2020 for the U.S. Chemical Industries," supported by the U.S. DOE and with major support from Earl Beaver and Sharon Robinson, among others.

The problem is that, as the great George Keller (Union Carbide) pointed out more than 30 years ago, is that we don't use distillation because it is energy efficient (it isn't), but because it is CAPITAL-efficient. Saving energy has always been a good idea, but if you lose more in capital costs than you save in energy costs, you have gained nothing. What Keller made clear was that, while energy costs are certainly very volatile, and therefore very "visible" when they are especially high, in the long run capital and energy costs rise AT THE SAME RATE.

[continues ...]

Apr 27, 2016
[continued ...]

The reason for this is that, for large installations like chemical plants, capital IS energy. Energy is the main cost for making steel, cement, and the myriad other materials used in building chemical plants. Therefore, in the long run, you only win if you can save energy without spending significant additional capital to do so.

Meaningful caps or taxes on CO2 emissions may change the "ratio" of these costs, but perhaps not. If CO2 emissions just show up as an added cost of energy, that will simply show up in the cost of capital, just as the cost of energy always has.

I've spent much of my life working on separations technologies, and I applaud all efforts to improve efficiency in this critical area of industry, but I do feel it is vital to look at the ENTIRE cost picture of separations, not just the (explicit) energy portion.

Apr 27, 2016
230 gigawatts of energy per year, the equivalent of the total 2014 energy consumption of the United Kingdom.
annual energy usage of about 50 gigawatts

A gigawatt is not a unit of energy, it is a unit of power.
The average UK power use from all source (e.g., oil for transportation as well as electricity) is not too far from 230 GW, so that is probably what the article really means.

May 01, 2016
slaking the global thirst for energy could therefore get a substantial boost from

building 1000 1000 megawatt fission plants.

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