Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

Register Log in
  • Congratulations waross on being selected by the Tek-Tips community for having the most helpful posts in the forums last week. Way to Go!

nmr 1

Status
Not open for further replies.
paxondoug

paxondoug

Chemical
Nov 7, 2001
5
0
0
US
What processes are using NMR for process control? Am interested in learning more about NMR successes.
 
Replies continue below

Recommended for you

Sort by date Sort by votes
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.
 
Upvote 0 Downvote
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.
 
Upvote 0 Downvote
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.


 
Upvote 0 Downvote
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.
 
Upvote 0 Downvote
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.
 
Upvote 0 Downvote
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.
 
Upvote 0 Downvote
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
 
Upvote 0 Downvote
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
 
Upvote 0 Downvote
Status
Not open for further replies.
Back
Top