US3609324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for measuring the purity ratio of intermediate products in sugar manufacture
Assignee: Carl Zeiss AG
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Filing: 1969-02-05
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Granted: 1971-09-28
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Expires: 1989-02-05
Abstract
Abstract The proportion of sucrose in the whole of the dissolved substances of intermediate products in sugar manufacture is measured by: measuring the refractive index n of a sample of an intermediate product, measuring the polarimetric rotation Alpha of the same sample and then combining these measurements in the relationship Alpha /n- no to produce a ''''purity quotient'''' (no being the refractive index of pure water.) The numerical value of this quotient varies with the temperature of the sample. Therefore the temperature of the sample is maintained constant within a certain range and an additional temperature correction is effected. In a preferred form of apparatus for performing the measuring method, the result of the calculation of the quotient is reproduced in both analog and digital form respectively for controlling automatic process control computers and for actuating a device for indicating the measurements in visible form.
Inventors
- 👤 Meinrad Machler
- 👤 Horst Loffler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:43
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/02; G01N33/14; G01N33/143; Y; Y10; Y10T; Y10T436/00; Y10T436/12
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
60 words
The method of claim 1 in which the difference between the refractive indices n and no is directly measured refractometrically and in which this difference and the polarimetrically measured angle of rotation Alpha are in the form of electric quantities, and in which the respective electric quantities are combined electrically to produce an electric signal representing the quotient Alpha /(n-no).
Claim 2
Dependent Claim
57 words
The method of claim 2 in which the electric signal representing said quotient is produced in analog and in digital form, whereby said analog form is available for the application to control the operation of a process control computer and said digital form is available for operating an indicating device for reproducing said quotient in visible form.
Claim 3
Dependent Claim
13 words
The method of claim 1 in which said sample is diluted before measurement.
Claim 4
Dependent Claim
44 words
The method of claim 1 in which said quotient Alpha /(n-no) is produced in the form of an electric quantity and in which said quotient is electrically multiplied by a factor F in order to relate said quotient to the conventional purity quotient (Pol/Brix).100.
Claim 5
Dependent Claim
100 words
The method of claim 1 in which the difference between the refractive indices n and no is directly measured refractometrically and in which this difference and the polarimetrically measured angle of rotation Alpha of the sample solution are reproduced in the form of electric quantities, and in which the respective electric quantities electrically produce an electric signal representing the quotient Alpha /(n-no), further comprising measuring the temperature of the sample solution, reproducing electrically a temperature factor, and multiplying said quotient by said factor electrically in order to correct the influence of the temperature of the sample solution on said quotient.
Claim 6
Dependent Claim
18 words
The method of claim 2, in which the electrical signal representing said quotient is produced in analog form.
Claim 7
Dependent Claim
18 words
The method of claim 2, in which the electrical signal representing said quotient is produced in digital form.
Claim 8
Dependent Claim
33 words
The method of claim 1, in which the difference between the refractive indices n and no is measured refractometrically, and in which said combining step combines said last-mentioned measurement and said polametric measurement.
Claim 9
Dependent Claim
43 words
The method of claim 9, in which a temperature measurement is made on the sample solution, and in which said combining step combines said temperature measurement with said quotient to correct the influence of the temperature of the sample solution on said quotient.
Claim 10
Dependent Claim
12 words
The method of claim 1, in which said measurements are made concurrently.
Claim 11
Dependent Claim
63 words
The method of claim 1, in which the sample solution is continuously flowing and in which said measurements are continuously made on separate like divisions of the sample flow, the first-mentioned measurement being a refractometric measurement of the difference between the refractive indices n and no in one of said flow divisions, the second-mentioned measurement being made in another of said flow divisions.
Claim 12
Dependent Claim
15 words
The method of claim 1, in which said measurements are Made at the same temperature.
Claim 13
Dependent Claim
171 words
Apparatus for measuring the proportion of sucrose in the total of dissolved substances in liquid intermediate products in sugar manufacture, comprising a mixing device, first conduit means connected to said device for supplying to said device a sample flow of one such intermediate product having an unknown sucrose content, second conduit means connected to said device for supplying a flow of pure water to said device, refractometric means including a measuring cell connected to the output of said device and accommodating mixed liquid discharge thereby, polarimetric means including a measuring cell connected to the output of said device and accommodating mixed liquid discharged thereby, said refractometric means producing an electrical signal output proportional to the difference between the refractive index n of the sample liquid and the refractive index no of pure water, said polarimetric means producing an electrical signal output proportional to the angle of rotation Alpha of the sample liquid, and quotient-calculating means electrically responsive to said signal outputs and producing an output indicative of the quotient Alpha /(n-no).
Claim 14
Dependent Claim
35 words
Apparatus according to claim 14, in which said cells have separate and like connections to the output of said mixing device, whereby they are simultaneously subjected to like but divided flows of diluted sample liquid.
Claim 15
Dependent Claim
37 words
Apparatus according to claim 15, in which heat-responsive means producing an electrical signal output is positioned at the output of said mixing device, said heat-responsive electrical signal output being connected in temperature-correcting relation to said quotient-calculating means.
Claim 16
Dependent Claim
19 words
Apparatus according to claim 14, in which said conduits each include a pump, said pumps having a common drive.
References Cited (Backward Citations)
GB1095210A
Cited
US3468607A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |