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I was a first time user and it was late at night and the PDFfiller.com information was a little confusing. I had problems opening the document on my computer as it was not readable. I reported this via live chat around 12:45 AM and it was resolved in about 10 mins or so. I was happy with the outcome.
2015-01-27
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2015-12-01
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2016-06-14
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2019-05-21
It really is an easy to use application…
It really is an easy to use application and i needed something like this and I didnt have much time so I know if I can use that fast then its a great app!
2020-03-11
This is an amazing website!
This is an amazing website and it has been extremely helpful for me. it makes it really easy to send in important paperwork at the last minute as I do oh so often.
2020-03-04
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The best feature is that you can use the check and cross marks easily!
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I dislike the fact that there isnt a hand-free drawing feature. I wish I could draw lines and curves on top of some pictures, for example!
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I use it to grade my students papers in Pdf. It is easier to attach hand written exercises to pdf, and then go directly to pdffiller.
2021-04-19
Excellent and very useful. And good customer service! I was confirmed a refund quickly after contacting them (although I still have to wait for the transfer)
2020-11-16
It works well in that you can fill out the form, but...
It works well in that you can fill out the form, but it would be great if you could move the text box once you've started. I was unable to do that and had to start over in some cases because alignment was off.
2020-05-15
Pack Columns Document Feature
The Pack Columns Document feature simplifies your document management. It allows you to organize your information neatly and efficiently, making it easy for you to access and present your data. This tool can significantly enhance your workflow and productivity.
Key Features
Consolidate multiple columns into a single pack for easier management
User-friendly interface for quick navigation and editing
Seamless integration with existing document formats
Customizable packing options to suit your specific needs
Instant preview of packed columns before finalizing
Potential Use Cases and Benefits
Streamline data reporting tasks for businesses
Create organized presentations for meetings
Enhance collaboration among team members on projects
Facilitate easier data analysis for researchers
Assist educators in managing curriculum documents
The Pack Columns Document feature addresses common challenges in document organization. By consolidating your information, you can eliminate clutter and confusion. This tool saves you time, allowing you to focus on what truly matters in your work. With its refined organization capabilities, you can present your ideas clearly and effectively.
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What is column packing?
In industry, a packed column is a type of packed bed used to perform separation processes, such as absorption, stripping, and distillation. A packed column is a pressure vessel that has a packed section.
What is column packing in chromatography?
In chromatography: Column chromatography. A packed column contains particles that either constitute or support the stationary phase, and the mobile phase flows through the channels of the interstitial spaces.
What is column chromatography and how does it work?
Column chromatography in chemistry is a chromatography method used to isolate a single chemical compound from a mixture. ... Column chromatography can be done using gravity to move the solvent, or using compressed gas to push the solvent through the column.
What is the purpose of column chromatography?
Column Chromatography is a preparative technique used to purify compounds depending on their polarity or hydrophobicity. In column chromatography, a mixture of molecules is separated based on their differentials partitioning between a mobile phase and a stationary phase.
Why is silica used in column chromatography?
Silica and alumina are both polar adsorbents so the more polar components in the mixture to be separated are retained more strongly on the stationary phase and are therefore eluted from the column last. Silica is recommended for most compounds, but as it is slightly acidic, it preferentially retains basic compounds.
How does a packed column work?
Packed towers work by providing a large amount of surface area per unit volume to facilitate the liquid-vapor mass transfer. As the liquid phase flows through the tower, the vapor and the liquid are in continuous contact on the surfaces of the packed bed, differing from the stepwise contact of tray towers.
What is the role of column packing?
Column structure: random and stacked packed columns Packing material can be used instead of trays to improve separation in distillation columns. Packing offers the advantage of a lower pressure drop across the column (when compared to plates or trays), which is beneficial while operating under vacuum.
How does a packed bed work?
The purpose of a packed bed is typically to improve contact between two phases in a chemical or similar process. Packed beds can be used in a chemical reactor, a distillation process, or a scrubber. ... Instead, packing is used to increase the contact area between the liquid and vapor phases.
What is the difference between packed column and tray column?
At this time, sieve tray columns are probably the most popular for both absorbers and strippers in conventional, large commercial amine plants; while packed columns are often used for revamps to increase capacity or efficiency and for special applications.
What is loading in packed column?
Originally Answered: what is loading point in packed column ? Loading point of a column is when the gas velocity is high enough to restrict the flow of liquid. After this point, the pressure drops at a much faster rate till another point, known as the flooding point, when all the liquid is carried away by the gas.
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