NIRSpec UAN analyzer

on-line analysis of Urea Ammonium Nitrate composition

- including Biuret -

NIRSpec UAN Process analyzer

NIRSpec image

The state of the art solution for on-line analysis of the composition of Urea Ammonium Nitrate.

NIRSpec UAN analyzer can measure not only the concentrations of the main UAN components: Urea, Ammonium Nitrate and Water, but also the concentration of the unwanted by-product Biuret, which is becoming an increasingly important quality parameter of UAN.

Accurate continuous/real-time measurements and the unique capability of measuring the concentration of Biuret enable a better control of the quality of the UAN in the production process.

The analytical technology is based on the Near Infra-Red spectroscopy and the state of the art proprietary multivariate calibration.

NIRspec installation on urea plant, scheme

Features

On-line measurement of 4 UAN components: Urea, Ammonium Nitrate, Water and Biuret.

Durable industrial design.

Accuracy up to 0.1% wt.

Turbidity compensation.

Compensation for product temperature variation.

Low sensitivity to optical window fouling.

Automatic washing/cleaning of optical windows.

Operating pressure up to 10 bar.

Operating temperature up to 120 °C.

RS485 MODBUS interface.

IP68 rating.

Biuret concentration

biuret concentration NIRspec vs lab

We developed a unique (PAT) solution for on-line analysis of UAN composition, which enables measuring not only the concentrations of the three main UAN components, namely: Urea, Ammonium Nitrate and Water, but also the concentration of the undesirable by-product Biuret, which is becoming an increasingly important quality parameter of UAN product.

Quantitative analysis of Biuret on-line is a particularly challenging problem, because the physical and chemical properties of the biuret molecule are similar/close to those of Urea. Therefore, analytical methods (PAT solutions) involving measurements such as conductivity, refractive index and density generally do not solve it satisfactorily. And, this is further complicated by typically low concentrations of Biuret in UAN.

Near-infrared (NIR) spectrometry has a better selectivity, however the similarity between the absorption spectra of the two molecules is still high and building/obtaining a good calibration is a difficult problem the solving of which requires R&D and deep expertise and knowledge in the field of multivariate calibration (chemometrics) and applied spectroscopy.

We solved it and developed the state of the art calibration model capable of resolving not only the three main components but also biuret.

Advantages

On-line measurement of Biuret concentration (in addition to the main 3 UAN components).

Accuracy up to 0.1% wt. (for all components).

State of the art (proprietary) multivariate calibration with compensation for product temperature variation and for turbidity.

Robust, durable industrial design (no moving parts).

Large transillumination area, hence less sensitivity to optical window fouling, better repeatability.

Benefits

Continuous on-line quantitative analysis of UAN for better process (product quality) control.

Measurement of 4 UAN components: Urea, Ammonium Nitrate, Water and Biuret.

Eliminates time-loss and cost for sampling and laboratory measurements.

High accuracy, repeatability and stability.

Low operating and maintenance costs.

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