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nmr 1

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paxondoug

paxondoug

Chemical
Joined
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What processes are using NMR for process control? Am interested in learning more about NMR successes.
 
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I am interested in process control. In fact, that is my business. But please enlighten me what NMR stands for.

tkyeo
 
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Very limited as regards to continuous processes. Most NMR systems are batch tests best suited for the lab.
 
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NMR is used extensively for on-line polyolefin morphological measurements. Like Paxondoug would like to know other areas.
 
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we used it to determine the degree of hydrogenation in a food process. continuous monitoring was not a requirement.

the on-line application of the measurement is a new one to me.

a variation of nmr is used in down-hole oil exploration.
the usual focus of lab-nmr is on the molecular environment of the hydrogen atoms in the material.
 
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Was that something like "fat in food" or a similar type measurement? What was the alternative method?

Thanks.
 
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Online NMR is used for the determination of both RON (Research Octane Number) and MON (Motor Octane Number) for gasoline blending stocks. This online measurement is used to allow a refinery to blend different stocks of gasoline in real time to meet an export RON or MON.

C.
 
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Rail~

it was a determination of the ratio of two types of edible oils. the degree of hydrog. was the only way to quantify it, other than a series of testing by individuals.

Was un-aware of nmr usage in octane analyzers.


 
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nosa ~

Thanks for the information. Can you answer if this is applicable to broadline (less than <40MHz)NMR or is chemical shift analysis required?

I have found several laboratory applications, but very little on-line.
 
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As for lab testing I've seen it being used to determine oil content in paraffin waxes, with a high degree of correlation with other specific tests such as ASTM D 721 and IP 158.
 
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We use process NMR to control on-line and off-line (lab)polymer production with over 40 production lines worldwide.

Low field NMR is also used in a number of other industries:
- Food - moisture, fat and oil content, droplet size, composition of dairy, oils, starches, rice, fruits, vegetables, etc.
- Agriculture - moisture and oil content, composition of soil, seeds and feeds.
- Petroleum - oil content, octane numbers, free/bound components, viscosity, porosity, pore size in coals, waxes and rocks, crude oil blending.
- Chemicals - free/bound moisture, viscosity, activity, loading efficiency in powders, catalysts, liquids, detergents, and pigments.
- Cosmetics - moisture and oils in powders and pigments.
- Pharmaceuticals - (moisture / oil contents, coatings, composition in capsules and tablets.
- Polymers - density, crystallinity, rubber content, dispersion of fillers, copolymer content, solubles, melt properties, extent of cure, moisture and plasticizer content, polymer mixing, crosslinking, finish content, tensile strength, etc.

There are a number of companies which offer this service to get you started
- Progression, Inc (formerly Oxford)
- Process NMR Associates (great web site with details)
- Bruker MiniSpec
- Process Control Technology
- Resonance Instruments
- Foxboro

Most systems are low field NMRs 10-30 MHz though processes that examine mobile liquids can use higher magnetic fields to improve results (50-100 MHz). Most low field NMRs are lab units to my knowledge with only some petroleum and polymer applications actually using on-line systems to control the process directly.

Hope this helps.
 
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online NMR analyzers are gaining further penetration in controlling refining processes. Online applications include:

- measure composition of reformer product (reformate) to fine tune reformer serverity and light/heavy reformate split.
-measure aromaticity of gasoil feed to FCC to tie into DMC controller or just to monitor process health.

Cheers
 
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John,
What is the application in coal slurry? What do you determine via NMR?
 
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In the mid 1980's there was a published study using nmr for flow measurement in coal slurry. I may still have something at home. A web search would be better for current applications.

John
 
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Khan101 and John,

NMR also is now used for BTU measurements in coal
 
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A quick web search for "flow measurement coal slurry nmr" found lots of nmr reference stuff.

John
 
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